Pffft... Please don't tell me that you are even trying to compare the amount of detail of COD4 to Crysis. Cod4 looks nice but Crysis at very high settings is insanely beautiful and detailed. Not to mention that all the lighting and shadows are all dynamic, bigger levels, day time changes, physics, interactive enviroments, etc.
The coding in Crysis is actually very good if we base it on how much is going on at any given moment compared to COD4.