Excellent point. A 5MP CCD can print upto a meter / 3 feet wide, and you wouldn't notice anything. Anything more than 5MP can be used for murals, or if you want to zoom in digitally afterwards because you accidentally filled only 5% of the photo with what was important to you. Also read the post from jragosta.
In real size comparison between Galaxy S 4, SIII and iPhone 5, iphone looks miniature :-)
Point taken; I prefere my iPhone 4" screen over the competitors larger ones'.
It's too big for me, but other people like a larger screen. I just hope the software works for them as well; I'm certainly happy with iOS, it's every now and then updates and added features and how it integrates with other services and hardware from Apple.