Interesting. I too am an iPhone lover who recently picked up a Nexus 4 to get into Android development. This is my first experience with Android, so I didn't realize that the Nexus 4 Android experience might be different than your typical Android smartphone. I was very impressed with the overall experience. If I wasn't so used to iOS, I could easily see myself using Android on a Nexus 4. But in the end, I walked away…
Are you kidding me? The iPhone has the optimal width? You sound just like Marco, Gruber, and all those other Apple sycophants who were claiming that the iPhone size was perfect for the hand, until the iPhone 5 came out, of course. Just like they got their thumbs surgically altered when the 5 came out, no doubt you will be getting all your pockets resized if Apple increases the iPhone width.
I don't think I could use a 4" device like a Nexus 4 (I have a Nexus S which was a good size), on my commute where I need to hold onto a handle of the train, underground with one hand, smartphone in other.