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I personally think that chasing sharpness or IQ in vintage lenses is a mistake altogether. Of course modern lenses are going to completely blow old ones out of the water, and they have autofocus, etc. But that's not really the point.
Really, whenever I look back over thousands of photos I've taken with my vintage lenses I'm almost never disappointed with sharpness. I fuck up just about everything else all the time, but shit is usually sharp enough for me.