I don't think he would be so quick to say it's worth the extra screen space if he weren't left-handed. Reaching the back button with only your right hand, even on the 3.5" screen is difficult. After switching to an iPhone 4s earlier this year I found that to be the major failing of the device: http://dmaurolizer.com/post/18478902007/ioss-major-flaw-reac...
I wonder what's more common: holding the phone in your off hand or your dominant hand?