AF quality is noticeably different on my HD 5870 at least with the 10.10 drivers, and even though the AF is borked in hardware on this card, it's still not that bad really (apart from the shimmering). I do run the driver at 'High Quality' settings though instead of 'Quality' so I guess I'm not being affected quite as much.
As pedantic as their rant is though, they do have a point, and it's been thoroughly tested and proven by a few sites already. You'd think that with cards as powerful as they are today, AMD shouldn't need to 'optimize' that much that it would affect IQ in any noticeable manner, especially for something as grass roots as texture filtering ffs.

