Burger King's out-of-home campaign "Finished" scored a "strong" 4.3 Star Rating on creative effectiveness platform System1 on April 22, 2026, placing it well above the UK outdoor average as the London Marathon weekend arrived. The ad shows exhausted runners wrapped in foil blankets, eating burgers at the finish line - and the data suggests that image landed.

The scores and what they measure

System1's Star Rating is the headline figure for long-term brand growth potential. It is derived from measuring emotional response to an advertisement using the company's FaceTrace tool, which has been applied to over 10 million people worldwide. According to System1's report on the "Finished" creative, a Star Rating of 4.3 places the ad in the top 6.2% of all UK outdoor image creatives - the "strong" band - against an average of 2.5 across the category. Only 2.2% of ads reach the "exceptional" threshold above that.

The Spike Rating, which measures short-term sales potential derived from the combination of branding strength and emotional intensity, came in at 1.12. That sits in the "good" band for the UK outdoor image category. The average for that category is 0.96, and the threshold for a "strong" rating is 1.19. The ad's emotional intensity score was 1.61, against the UK outdoor image average of 1.15 - a meaningful gap.

Fluency is the third core metric. It measures the percentage of people who recognised the ad as being for Burger King. "Finished" scored 91, rated "strong," against a category average of 84. The threshold for "strong" is 91 and for "exceptional" is 95. In practical terms, 91% of respondents had attributed the ad to Burger King by the end of their dwell time. Fast Fluency, which measures the percentage of people who correctly attributed the brand within two seconds, came in at 55 - rated "modest" - against a category average of 58. Brand recognition builds quickly throughout the creative, but the two-second attribution is the one metric where "Finished" sits slightly below the norm.

The emotional response breakdown

According to System1's FaceTrace data, 44% of respondents felt happiness when exposed to "Finished," against a UK outdoor image average of 30%. Neutral response was 34%, compared to an average of 52%. Disgust registered at 4% against an average of 1%, which reflects the predictable tension in showing fast food to people who may associate it with an unhealthy lifestyle. Contempt ran at 3% against an average of 5%.

The happiness data goes deeper than a single number. System1's methodology categorises happiness into twelve distinct types, ranked by their ability to drive business outcomes. The most commercially effective types - including "awe-inspired," "uplifted," and "excited" - are distinguished from less commercially effective ones such as "contented" or "pleased for others." The report does not isolate a single dominant type for "Finished," but the strong Star Rating indicates the emotional response is concentrated in the types associated with brand growth.

When respondents were asked to give reasons for their emotions, 16 people cited "tasty burgers," 10 cited "I love Burger King," 10 cited "she is rewarding herself after a run," and 9 cited "I enjoy Burger King so it's good to see an ad looking like that." Those verbatim responses, now a feature of the Test Your Ad platform, suggest the ad is successfully fusing appetite cues with a human moment rather than functioning as pure product promotion.

The audience that matters

There is a critical detail in the System1 data: the 4.3 Star Rating comes from a custom sample of people interested in fitness, aged 18 to 44, living in cities. When tested against a nationally representative sample, the Star Rating drops to 2.4 and the Spike Rating falls to 0.79 - both rated "modest." The Fluency Rating stays at 85 in the NatRep sample, still "good."

This comparison is significant for media planning. "Finished" is highly effective with the audience most likely to have run a marathon or to associate with the experience. It is less powerful as mass advertising. The System1 report includes a note that custom sample results are not directly comparable with nationally representative figures, but the contrast is stark enough to matter. The ad is precision-targeted creative, not broad-reach brand building.

The demographic breakdown within the NatRep sample reinforces this. Among 18-34 year olds the Star Rating is 3.9 (good), falling to 2.9 among 35-54 year olds and 1.0 (low) among those aged 55 and above. Men give it a Star Rating of 2.7, women 2.0. Age and fitness interest are the variables that move the needle most.

Distinctive brand assets

According to System1's report, 49% of respondents cited the logo or symbol as the element through which they recognised the brand - the most commonly identified distinctive asset. Colour was cited by 31%, font by 29%, and product or packaging shape by 24%. The scenario or plot was identified by 9% of respondents. Character or mascot and famous person or character scored 7% and 6% respectively.

The key associations generated by the ad are also notable. The top associations were: burger (51%), food (33%), tasty (32%), fast food (17%), running (15%), "why eat a burger after a run" (13%), reward (13%), and meat (12%). The 13% who spontaneously associated the ad with "why eat a burger after a run" is read by System1 as a reflection of anticipated social criticism rather than a failure of the creative - the negative sentiment does not translate into the emotional response data in a damaging way.

Andrew Tindall, System1's Chief Growth Officer for Advertising, said: "Burger King is very good at showing up authentically in moments that matter. Like 'Bundles of Joy', this latest campaign taps into something real, this time with runners heading into the London Marathon, and it does it without the usual fitness theatre. Most people are not living on kale and clean eating. They are putting in months of effort and looking forward to a well-earned treat at the end. That is human."

Tindall drew a direct contrast with Nike: "Contrast 'Finished' to Nike's Parkrun effort - which was comparatively lifeless, inaccessible, and rooted in fitness stereotypes - and the difference is clear to see."

The 'Bundles of Joy' connection

"Finished" is not a standalone creative. According to System1, the campaign builds on Burger King's earlier "Bundles of Joy" campaign, which showed images of real new mothers eating burgers from hospital beds. The structural logic is the same: a real human moment, directly after a physical and emotional effort, centred on food as comfort and reward. The creative continuity matters for brand building. Repeated use of a similar emotional register - exhaustion, relief, honest appetite - compounds recognition over time. System1's data on UK Easter advertising released on 30 March 2026 showed that brands with consistent long-term creative investment in distinctive assets outperform those relying on novelty each season.

Why the Nike comparison matters

According to System1, "Finished" is positioned explicitly against Nike's out-of-home effort tied to Parkrun. Nike's involvement in Parkrun has itself generated controversy in the UK, with criticism focused on whether a commercial brand's proximity to a free community running initiative changes the character of that initiative. System1's data on Nike's creative - which is not published in the materials provided but referenced by Tindall - is described as "comparatively lifeless" and "rooted in fitness stereotypes." The implication is that Nike produced imagery of aspirational athletes rather than ordinary people having a human experience.

The contrast is a useful case study in creative effectiveness methodology. A high-production, aspiration-led visual may score well on certain brand awareness metrics while generating lower emotional response because it does not connect with the realistic experience of most people who run. Burger King's creative does not show elite athletes. It shows a woman in a foil blanket, eating a burger, with her finish time displayed as 00:04:36 - a time that places her firmly in the broad middle of marathon performance, not among the competitive front.

Context for the marketing community

The OOH sector has consistently demonstrated stronger marginal return on investment than saturated digital channels. Research published in October 2025 by Keen Decision Systems found that out-of-home advertising delivers $7.58 marginal ROI, with sports and fitness performing particularly well at $9.51 per dollar - the highest of any category studied. Food and beverage reached $7.72. Those figures are relevant context for a fast-food brand choosing OOH as the medium for a fitness-adjacent campaign during a major running event.

System1 itself operates on a significant data infrastructure. According to the company, it maintains a database of over 100,000 ads and tests creative effectiveness across 81 markets globally. In April 2026, the company added AI-assisted reporting layers to Test Your Ad, including Instant Insights - AI-generated summaries that surface key findings without requiring users to read every chart. The "Finished" results were reported on the platform dated April 22, 2026, which puts them squarely in the updated platform environment.

The marketing community is watching creative measurement platforms with increased attention as questions about what makes advertising work have become harder to answer in fragmented media environments. As tracked by PPC Land, UK digital advertising expenditure reached £18.7 billion in the first half of 2025 alone, with the full-year market forecast to reach £45 billion by 2026. Against that backdrop, brands are under pressure to demonstrate that creative investment generates measurable return rather than simply generating impressions or reach.

The Burger King case is interesting specifically because it illustrates the difference between nationally representative effectiveness and targeted effectiveness. In an era of programmatic buying and audience-first media strategies, an OOH creative that performs strongly with a defined segment - fitness-interested urban adults aged 18-44 - may represent a deliberate choice to prioritise depth of emotional resonance over breadth of awareness. Whether the national sample scores matter depends on the campaign's objective. For a London Marathon activation, the segment scores are arguably the more relevant measure.

For media buyers and creative strategists, the data released via System1 on April 22, 2026 provides a rare public view into how emotional response measurement breaks down at a granular level - by demographic, by type of happiness, by distinctive asset, and by the speed at which brand recognition occurs within a six-second dwell time. Most campaign effectiveness data stays proprietary. This release, timed to a major sporting event and positioned against a competitor's creative misstep, makes the methodology visible in a way that is useful beyond the specific campaign being evaluated.

Timeline

Summary

Who: Burger King and System1, the London-based creative effectiveness company that operates the Test Your Ad platform across 81 markets globally.

What: System1 tested Burger King's out-of-home campaign "Finished" - depicting exhausted marathon runners eating burgers - and published scores showing a 4.3 Star Rating (strong), 1.12 Spike Rating (good), and a Fluency Rating of 91 (strong) among fitness-interested urban adults aged 18-44. The nationally representative scores are materially lower: 2.4 Stars, 0.79 Spike, 85 Fluency. System1 also drew a direct negative comparison between "Finished" and Nike's Parkrun-linked OOH creative.

When: The System1 test report is dated April 22, 2026. The London Marathon took place on April 26, 2026, providing the event context for the campaign.

Where: The campaign ran as UK out-of-home advertising, assessed under System1's UK Outdoor Image category benchmarks.

Why: The results matter for the marketing community because they illustrate how targeted creative effectiveness can diverge significantly from nationally representative scores - a distinction that matters for media buyers operating in audience-first programmatic environments. The comparison with Nike raises questions about fitness-adjacent advertising strategy: whether aspirational imagery or relatable human moments produce stronger emotional response and, by System1's model, stronger long-term brand growth.

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