The Sony 85/1.8 autofocus works pretty well (although I believe it focuses stopped down rather than wide open aperture, but then again it seems that most Sony lenses do that) and does not "hunt" too much, except a bit more in low light conditions.

The autofocus is fast and very accurate

It produces fantastic images, has fast autofocus, is small, light, f1.8, and has a programmable focus hold button that the $999 Sony 55mm f1.8 doesn't even come with.

Autofocus is very fast, even on the older bodies.