ATI cannot make working video drivers

[Kurz]

This is how 16xAF looks on NVIDIA GTX 470:


If you get D3D AF Tester, you will be able to compare your result with your pure awesomeness high-end ATI video cards -- set Mipmaps to Normal and Use Checkerboard Texture slider to 2.

On HD 5xxx series you will only see a flat gray disc in the middle. Someone might say "it is better filtering", but even if that was the case, transitions between filtering stages should not be as abrupt and harsh as they are on ATI cards. Whatever way you put it, anisotropic filtering is broken on 5xxx series.

Question is does this cause problems in today's games?
We are talking about a very specific situation here.