The Nikon 90/8 is THE 90mm to beat. Check the tests by Perez, et al, and the lens optical diagram. Simply the best 90 out there, IMNSHO. For 150s, the Apo-sironar S is considered about as good as it gets, though the Apo Symmar 150 and Fuji NW-S 150 are also top shelf.

-Ed