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jackc
As with most OM lenses the first versions were single coated. All others multicoated (considered better for colour).
21/24/28mm all come in f2/2.8/3.5 flavours. All are sharp afaik.
I quite like the slower lenses and have kept a 28mm. I tend to use wide lenses stopped down anyway and the f3.5 versions are cheap and totally tiny.