iPhone plus, using it for about a week.
I don't think it's awkward, but comfortable? that depends, I have been trying to use it one handed a lot and it's causing me some odd pains in my thumb and pinky. So overall I'm not finding it comfortable at all the way I'm using it.
I am using it one handed, and really stretching, so that's just my take.
Also been using it a lot, but I made up my mind now to buy the 4.7 inch 6 next year, hopefully it will get the optical stabilization.