Nexus was the one phone I actually would have considered switching to. Unfortunately it suffers from the same problem with grossly oversaturated colors, like all of the other crap Samsung puts out.
I don't understand how millions of people can buy Samsung phones when they make colors look like they were done with those boxes of 24 crayons I had as a kid. There is very little depth or distinction, just blindingly bright reds, blues, and greens.
Apple's screens are calibrated and more true to life, whether it's a phone, tablet, or computer. I still feel they make the best displays around, and that's not being a fanboy. It's just demanding a quality product. I'm a graphic designer, and these details matter.