Oh what the hell, ill give you the gp4 side anyway (well highlights)
Graphics:
Very good escpecially the new "helmet view" and there is the option to turn off the new reflections.
Physics:
Better than f1 2002, you can really feel the changes you make to the cars aswell, especially the plank under the car when you are going over hilly parts.
AI:
Hmmm, they arent so keen on these ai cars. They apparantly stay too much on the racing line (yeah wonder why :P ) and dont react that much to the players actions (hmm) so collisons often occur. And there are only
3 difficulty settings.
Steering:
Bascially good, the rest they say we all know
Summory:
"Despite great graphics, solid opponents and first class physics, gp4 remains on the second step of the podium. Proffessionals! [Us lot :P] will appreciate the game more and worry less about the out of dateness, and there still a hotseat mode"
So thats about it