I own the AI version of the f/3.5 for like 5 or 6 years. I lost it along with the Nikon F2AS. I currently have the f/2.8 version and I can't say which one is sharper but there is one thing that it seems the pics I take recently are not as sharp as those I took in the late 70's and early 80's. It's me or it's my lenses I don't know. So there Peter I hope I have an answer for you but I don't.