What I noticed was that the screen was not nearly as washed out as the Evo 4G. I also liked how incredibly smooth the screen transition effects were. I've always liked sense but I also like TW3 and TW4.
So the one thing that really caught me off guard was the 3D pictures and movies. I was a little shocked at how cool they looked. I totally thought it was going to look like crap and that the 3D would be a feature I would never use. WRONG! I would probably use it all the time.