It's been a long time since I've owned this lens, actually in my film days. So out of memory here goes. I found the lens to be quite sharp. But what bothered me was it had a lot of distortion on the edges and was a little soft in the corners. Now this was on a full frame film camera. As I recall it was well made and may have had an aspheric element. I traded it in for the AFS 17-35mm f2.8 in 2001. I still have that lens today.
I remember one particular shoot I had with this lens, a lot of piano close-ups I was thinking about buying for my wife. If I find the negatives I'll scan them but I'll have to look through a lot of negatives.