Maybe you should read your own link smarty pants... All but one bracket is won by ATI. Mid-high end = 6870 winnar. Mid range = 6850 winnar. Low mid range = 5770 winnar. Low end = 4850 winnar. The only one you can even argue is the top end 5970 vs 580 match up, which of course this was made before the price dropped on 5970, which right now at newegg are $469, making them win that one too.
Thanks for playing though brah!