Good advice from Dynachrome.
As for sharpness, i can only speak about my Canon New FD 135/2.8; it was sharp at all distances, even close ups. My Canon FD 135/2.5 has an even better reputation, but i can't confirm it yet.
My Nikkor-Q 200/4.0 pre-AI suffered from slight chromatic abberation and wasn't so sharp, but that's because i had the 1961 version. Still, it was sharp enough and the "bokeh" was smooth as fresh butter. I got some very nice portraits from it, and regret selling it. My Nikkor 200/4.0 AI is very sharp, "bokeh" is smooth but I feel the older version was even smoother, or with more "character".
As Dynachrome said, some years just before the release of the Nikkor-QC version, the optical formula was changed (but it still was 4 elements).