In Tomb Raider: Anniversary they did run Nvidia to 16x QAA while the ATI to 4x. So, it is not very fair comparison
I believe those the only games that benchmarked with AA enable. The other games benchmarked without having AA enable, and 9800GTX+ performed in majority of those games. So, this at least refute your theory about performing even without AA.
Personally, I say 9800GTX+ performs better most of the time without AA, while HD4850 performs most of the time with AA (though not all the time)
I think you like to cherrypick your results.
But, in knowledge of the fact that you won't change your mind anyway, I'm refusing to debate with you about it.