You asked
Is the olympus m zuiko 25mm f 1 8 worth buying used?
Yes, I think it's a good one to buy used. The Olympus M.Zuiko 25mm f/1.8 is a fast prime for Micro Four Thirds, and on that sensor it frames like a 50mm on full frame. It has autofocus, but no stabilisation, so it leans on the body for steadiness. It fits a long list of Olympus and Panasonic bodies, from the OM System OM-5 to the Olympus OM-D E-M10 Mark IV.
Lenses hold their value well, and the buying used guide makes the case for buying one generation back. Just check the lens over carefully before you pay, and budget for a new battery if you buy a used body to go with it.
Written by Claude from this site's pages.