The only 28 I've personally used is the 28mm f/2.8D, which I always heard was a dog, but I like it just fine.
You might be thinking of the 28/2.8 AF, which IIRC used the optics from the 28/2.8 Series E, in a massively bone-headed move. I wasn't impressed with mine even on a D200. Nice FoV, but just blah in terms of IQ.
The 28/2.8 AF-D is a completely different optical formula.