iPhone 4S produces more accurate colors. Overall, I'm delighted how great the image quality if for all cell phones; astonishing how far we've come in just a few years.
I think that the 4S shot is too red/yellow compared to the Galaxy II. This sort of comparison is pretty subjective though.
(aside for evanwalsh: for the record I hate my Nexus One and have a 4S on the way)
Without making sure parameters & the software used were the same, such a casual comparison doesn't seems too useful to me.
You may be able to say "this photo looks right" but that's pretty darn subjective. Turns out we humans are kinda useless for tests like these. Past a few megapixels this stuff really doesn't matter because things like focus, lenses, and lighting are so much more important than resolution. The photos are "sharp" enough and none of these phones support mounting lenses or lights on anything. So its kind of arbitrary. Unless one of these phones has an especially shitty lens or focus or bad software, they'll probably just look mostly the same. I consider these long solved issues and don't expect much difference.