watch the new movie. you'll see.
in terms of sheer graphics, re4 is prettier, i'll give you that. as was the original re0 remake for gamecube. the advantage being there's no "field" there -- its locked in environments with locked in angles and perspectives, limiting the range. they can push polygons and detail to the extreme, because there are limits in other fields.
there are compromises you must make to balance gameplay, design, visuals, frame rate, etc. for example, halo 2 is simply beauitful -- but the framerate is botheringly choppy at times. metroid prime 2 doesn't have anywhere near the detail or visual grace, but the frame rate is a solid 60 all through out.
in this game, you have a scope second to none. few games ever even come close to rivaling the size and depth of a zelda game. metroid prime? maybe. games like vice city come the closest.
but notice a difference in presentation between this game and vice city? the frame rate is way up. and, most importantly, the detail and visuals are way up.
this game, from the reports, is gamecube pushed to the max.
and it shows.