Yah, I payed both, Crysis does look awesome at some things, like the shadowing, weapons, suit, but they also have some not so awesome things in there, like the koreans, cartoonlike and fake...combine were much more realistically rendered, some close up textures look super dated and like they are rendered 640x480, and the foliage looks good till you crawl through it, I can actually tell which parts of the bushes are triangles because the texture looks flat, not transparent, and large blocks move like a well...large block. That's not how things move in the real world, I have a tree branch 8 inches from my window to prove it.
When you look at things in HL2 close up, they don't look blocky, or flat, but they are static also.
In crysis things look really good till you get super close to SOME things, HL2..EVERYTHING looked good close up, but not a lot of stuff moved or blew up either.