Here are some Comparative screen shots of Fifa 09 and Pes 09.. its with 8800GT with all graphics option set to full.
Crowd
Fifa 09 :
Pes 09 :
Gameplay view :
Fifa 09 :
Pes 09:
Players model :
Fifa 09 :
Pes 09 :
3d Grass :
Fifa 09 :
Pes 09:
Net :
Fifa 09 :
Pes 09 :
will be updating .. please post your screeshots as well