Keep in mind though that both 75mm and 90mm focal lengths are difficult to focus when you are shooting wide-open, so a viewfinder magnifier (or else a camera with the 0.85mm viewfinder magnification) is a real plus.
I had already decided to go for one with a 0.85 viewfinder, and the 75mm is a good idea but they seem to be as rare as hens teeth, so have not had a chance to test. The 90mm through the .85x is fine though.
-------------------- Be yourself you know its true and in the end whats left is you.....