Honestly, this is a moronic comparison because (as always) it is very difficult to maintain high graphical fidelity in a large-open world, or a game where the environment is heavily dynamic. This is why games with closed environments that aren't particularly large or dynamic (Resident Evil 4, Gears of War, and Metal Gear Solid 4 as examples) tend to have much better visuals on the same hardware than games with larger or more dynamic evironments. Crysis has very large environments which are far more dynamic than Metal Gear Solid 4, and still has similar (or in many people's opinion better) visuals on medium settings on pretty inexpensive (in PC terms) hardware.