Where I can compare as I have more than one copy, I see that the mc's are better than the md's. You are quite right to ask about sample variation. The 1.7's are all very similar and the f2 is close. the 1.4's are a lot less sharp than the 1.7's until down to f2.8. The three 1.2's are very blurred until down to about f4. Rather a sad collection I've built up over the years! I'm particularly interested in wide open (or about f1.7 performance) as I shoot a lot of low light stuff. Each lens tested from wide open and at each aperture down to f8. They are basically like a Snellen chart (for eye testing) with letters that get smaller on each line. The target is a large board mounted on a wall, with targets in the centre, side and each corner. Overcast lighting, delta 100 film, scanned on 5400 at 5400, sl levels change, but the same for each shot. Larry, All were tested on an xd7/11 (with zero'd focus), on a tripod with cable release on a still day.
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