Well, unfortunately the shots weren't at the exact same position, so a good compairson isn't possible.
Regardless, two thing stuck out to me. My shot (GeForce4) looks clearer on the hillside to the right and the ramp. Yours looks clearer on the underside of the curved hornlike structure in the center of the shot.
Then again, mine was also closer, so it's really not a perfect shot.
Did you take that shot precisely at the spawn point in the full version? If so, it looks like they changed the spawn points very slightly...
Oh, yeah, and your tree is much clearer, but I'm willing to bet that's due to a higher detail texture.