I would say that some of the older ones had less creep in SA, and that MAY be a function of breaking in - used ones have a 'mature' mating of the hammer and sear.
I have never felt one that had ANY grit in it. Smooth as butter. Some are lighter than others - none have been heavy (as in over 10 LBS).
I have felt plenty of CZs that are over 10 LBS - in fact all OTB that I've seen are. I read and hear reviews to the contrary - I just have a tough time believing them.
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