You asked
Is the olympus m zuiko 7 14mm f 2 8 pro worth buying used?
Yes, I'd happily buy this one used. The Olympus M.Zuiko 7-14mm f/2.8 PRO is a wide zoom for Micro Four Thirds. On that sensor it frames like a 14-28mm on full frame, and f/2.8 gives roughly the depth of field of f/5.6, so it's a strong choice for landscapes, architecture, and interiors. It has autofocus but no built-in stabilisation, so you'll rely on your camera body for steadiness.
Pro lenses hold their value well, so buying used is one of the best ways to get it for less. Check the glass for scratches and fungus, and test the autofocus before you pay. For more on buying second-hand, see Buying used. The lens's full specs and the bodies it fits are on its catalogue page.
Written by Claude from this site's pages.