Here's a comparison of one of Nikon's poorly regarded lenses, the AI 43-86mm f3.5 and a highly regarded lens, the AF 85mm f1.4D.
The zoom was shot at 86mm f3.5 with the AF 85mm at f3.5 as well.
AI 43-86 on the left. 100% crops from the D3X.
The AFD 85 clearly has improved resolution and contrast. Actually the 43-86 photo looks better then I expected. But that's typical of nearly every lens I use in the D3X. Wait a couple months and I'll run the same test with the D800.