Since getting the iPhone 5 last Friday the one major dislike of the phone was that the screen felt small. I have a good feel of the keyboard because the keyboard felt cramped.
Fast forward 5 days later.
The keyboard is looking and feeling more and more comfortable the longer I have the phone. The iPhone is extremely easy to type with just one hand.
On the Galaxy Nexus I would have to sometimes hold the phone with one hand and type with the other.
The screen size is definitely a step down compared to the Galaxy Nexus but the iPhone 5 makes that up with better functionality.
Typed this post with the iPhone 5 one hand style.