Ignore all of the cell benchmarks at the top since the Rezound is on LTE and the Galaxy S2 is not.
AnandTech - Bench - Smartphone11
Nearly double the performance in all of the gpu benchmarks is not what I would call negligible. Also keep in mind that is the lower clocked Exynos (1.2ghz) vs the highest clocked S3(1.5ghz), if you compared the two versions of the Galaxy Note against each other the performance gap would be even larger since it has a 14.ghz Exynos.
The two year old Galaxy S can play any 720p content just fine so that isn't a big deal these days, Exynos will handle 1080p high profile H.264 without any problem as well as any other 1080p content you throw at it. The Galaxy s2 does have a MHL output as well so the extra resolution is useful.