Yeah, I always felt (and still do) that the graphics in DKC looked more like a painting to me rather than being 3D-rendered. There are definitely way more obvious examples of pre-rendered graphics out there, like the sprites in the 32X version of Blackthorne (bleh!) or some of the locations in the Playstation Final Fantasy's.
My absolute favorite art in the series has to be the Ghostly Grove in Gloomy Gulch, with the parallax-scrolling lighting through the trees and such.
Love that AND the music to go along with it. I procrastinated finishing the level just to stand around in it for a bit. Of course the whole game is simply beautiful IMO.
http://www.youtube.com/watch?v=Fqy6kjKlPwgAll the YouTube videos I found don't do it justice though IMO; the YT encoding muddies it up quite a bit. Would have to fire up the SNES and give it a play-through.
BTW, another random great aspect of DKC2 (even more than DKC1) is the incredible feeling of control with Dixie and Diddy. The platforming is spot-on and fluid as hell, IMO.