I've read through 50+ pages of this thread and found it profoundly entertaining and informative, especially since I have never used any kind of Olympus gear before. However, I must jump in now because I'm considering the local purchase of a small collection of OM lenses. I must disclose that 95% percent of my work involves both small- and full-frame Sony video cameras, with a rig considerably bulkier and heavier than a 35mm SLR or A7, etc., and so I'm attracted to the optical quality of Olympus lenses and their compact size and light weight. I've been informed that for the 50mm F1.4 I should aim for a serial number over 1.1 million. One question I have is, how important is it to look for MC versus earlier versions of the same lens? Should I pay significantly more, say 10 to 20 percent more, for a lens with the latest multi-coating?