While disappointing that here are no easy to read benchmarks, it's possible to discern general performance from a few key points: The HAWX benchmark in the deep dive slides and the FARCRY2 GF100 vs. GTX285 video. (Check out guru3d's video of the Farcry2 benchmark for extra info). GF100 is ~ 68% faster in FC2, and 61% faster in HAWX, both using 4xAA, compared to a GTX285.

HD5870 is ~35% faster than a GTX285 1920 4xAA, according to Computerbase.de. Also, an HD5970 is ~90% faster than a GTX285. The tested GF100 part sits between a HD5870 & HD5970, closer towards the speed of the 5970. And it appears GF100 handles 8xAA better than HD5000. I rank them as so:

GTX285: 100%
HD5870: 135%
GTX3xx: 168%
HD5970: 190%