Not gonna lie, but the only people who will buy a phone that measures more than 4" are the people who have never owned one.
I OWN the Galaxy S2. I can tell you right now that I will never buy a phone bigger than 4" again. You CAN'T hold it properly. Again I will say this - if the iPhone 4S appears with no redesign, I wouldn't be any less than happy at the thought the screen size has been kept constant.
Feel free to downvote - you'll realize how wrong you are when you buy your Nexus Prime and you can't even slide down the Notifications Bar from the top with your thumb because you can't reach it.
I bet you didn't own it. Initially I thought it was OK, but then I realized it's far too big and has a lot of inconveniences, the biggest one being the inability to easily slide down the notifications bar from the top with one hand.
Your hands must be extremely small. I have a DroidX and love the screen size. My wife has an iphone4 and I cant stand using it because the screen is so small. I will go back to iphone as long as the new one has a 4" screen. If not I will probably go with the GSII.