This is an interesting video to see. It seems the Apple iPhone 4s and the Samsung S3 use the same camera module. This clip is made as a split-screen with on the one side the S3's image and on the other the iPhone 4s' image. They also constantly switch between devices for audio so you can also clearly hear the difference in audio quality.

I must say the Apple's image looks better to me, but that didn't really surprise me. What did surprise me is the enormous difference in audio quality... the Apple sounds a whole lot better ; I didn't expect that. I must say Samsung disappoints here. (and I'm no Apple fan, I just want the best product for the best price).