Everything looked the same so far to me, except Crysis Warhead... in the detail picture you can see the ATI picture is much higher detail on the grass/ground.
*edit - Fall Out 3... in the detail picture the ATI folliage has higher detail up close, but it looks like there is more overall folliage with the Nvidia image. Odd. Also, if you look at the ground right before the street, when you switch over to the ATI image, again it looks like it is less blury then the Nvidia image. Not as noticable as Crysis Warhead, but if you look for it it's pretty easy to see. Not something you'd see in game I'd imagine, though.
*eidt2 - At Farcry 2 now. Is it just me, or in Farcry 2 is the ATI image (again looking at the 'detail' image) casting more shadows then the Nvidia image? Look at the train tracks, and then switch the images. It looks like the ATI image casts a shadow from the tracks, Nvidia doesn't. Again, not something I'd notice in game, but I see it in the stills.