I bought an iPhone 6 recently figuring I'd skip the obviously too big 6+. While I like most of the features I've found even the base 6 is a too big. My thumb doesn't even reach all the way across the bottom of the screen and only about half way to the far corner if I'm holding the phone in a good stable grip. Even reachability mode doesn't get everything in close enough. I wish that it shrunk the screen slightly as well. I find that I either have to carefully balance the phone or use two hands. I've already drop it a few times trying to reach the stuff just a bit to far, and the area between my thumb and rest of my hand hurt the first few days after I got the device from trying to force my thumb to reach across. To be honest I was expecting it to be a bit big as there is a small part of an iPhone 5 screen I can't reach without shifting the phone but that bothered me only occasionally. Going to stick this one out, but not sure I want another large phone, especially since I carry a tablet* with me most of the time. Granted I guess I have short hands, my thumb is almost 1.5" long.
* - Okay, sometimes I carry up to 3 with me so that I have Android, iOS and Surface covered; as part of checking to see how stuff runs on different OSes. And yes tablets are much bigger, but they are two handed devices.