I've only had the iPhone 5 for just over 2 weeks and feel that the screen size is just right for every day use. It isn't too small and isn't too big. I didn't get the Samsung Galaxy S III because it felt like carrying a tablet around.Samsung Galaxy S III and Note II.
I don't like Iphone 5 because the small screen is already out of date and it still have no NFC function. the most importantly, iphone 5 is too expensive