Hey, I just upgraded from epic too. I compared screens and what i realized is that the epic has more saturated colors, which make it look prettier
lol i am a fan, but i dont think the nexus has washed colors, just more accurate. To compare, I took a pic of the same thing on both phones and I realized the colors were more accurate on the nexus then then my Epic.
On a side note I actually miss touchwiz, god how i hate/2lazy going to setting to turn wireless stuff on. I even purchased beautiful widgets to speed things up and the 4g widget doesnt even work.
One thing I did noticed is that the epic screen, when set to auto-brightness is brighter then the nexus at same settings. This made it hard for me to read in sunlight and I didnt like the nexus initially b/c of it. So i just turned off auto-brightness and put it at a setting I like.
Ill let you know if I think it was worth it to get a Nexus, considering our Epic was just as good. Essentially is pure google and Instant updates worth it?