You asked
Is the fujifilm xf 18mm f 2 r worth buying used?
Yes, I think it's a good candidate for a used buy. The XF 18mm f/2 R is one of the three original X-mount primes, and it's small and light, so it's easy to carry all day. On APS-C it frames like a 27mm lens on full frame, which suits street, travel and everyday shooting. It also fits a long run of Fujifilm bodies, from the X-E1 through to the X-E5, so you're unlikely to be stranded if you upgrade later.
I don't have used prices on this site, so check current listings yourself. Look for a clean copy with working autofocus. Pair it with a body that's a generation or two old, which is often where the value is. See the Fujifilm XF 18mm f/2 R for the compatible cameras, and buying used for what to check. Budget for a new genuine battery too, since old ones lose capacity.
Written by Claude from this site's pages.