24 bit, 8 bit, and 4 bit refer to color depth. It's comparable to pics of identical resolution, say 400x300, but one pic is a bitmap, one is a jpeg, and one is a gif. The GC can run the pic as a jpeg, so all details would still be there, but with some artifacts (and they do show up in the GC version, just rarely). Since the PS2 can only run bitmaps and gifs (or pngs), it would either have to drop the resolution of a bitmap just to keep the color depth, or stick with a lower color gif, which would still be the same resolution.
Thus the color is lower, but the resolution is the same. You can see that in some of the comparison pics if you look close enough.
I'm not disputing the polygon count, so that's irrelevant.
And I'm not disputing the framerate drops in the PS2 version. Yet it can happen in the GC version, just with 12 or more enemies instead of eight to ten.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs
