I just exchanged my Rezound for a Nexus this morning. I originally came from a Motorola Photon (QHD Pentile) and before that an HTC Evo 3D and then Iphone 4.
I picked up a Rezound primarily for the screen. I thought the screen was fantastic (compared to the Photon and definitely on-par with the Iphone 4).
My main comparison test is to go to a webpage like androidcentral.com or phandroid.com and look at the text zoomed all the way out. Can I read it without much effort? If so, it's a win. The Rezound had zero problems here. No jaggies at all. For comparison, the Photon was illegible.
The Nexus comes to about 90% of the Rezound in my viewing so far as far as small text on a white background goes. The text is legible, however zoomed that far out it looks just very slightly distorted. If I had to rate the Rezound a 10, Iphone 4 10, the Nexus would be an 8-9 and the Photon a 4-5.
Otherwise, the Nexus is much faster than the Rezound. With the Rezound, I noticed constant lag in the browser and even on the pulldown menu. Blame Sense. I get none of that with the Nexus.
As for the camera, the Rezound camera was never showing me accurate colors - everything was completely saturated with red (unless I clicked on sport shot mode and then went back to auto). It was difficult to get a good focus - although the image quality was decent when snapped. The photos on the Nexus snap very quickly and look very good. I haven't had any focus or color issues.
Google music runs without issue on both phones. I never used the Rezound headphones.
Typing on the Nexus is far better and lag free. The Sense keyboard was problematic.
Reception. I get bad reception here at my house. The Rezound had me on LTE (low bars) everywhere in my house. The Nexus has me on a mix of LTE and 3G with low bars. Phone calls work on both.
The power and volume buttons are nicer on the Nexus. I couldn't stand that flush volume button on the Rezound.
Overall I am impressed with the Nexus and it was worth the $35 exchange fee.