You asked
Is the 7artisans af 85mm f 1 8 worth buying used?
Yes, I think it's a sensible used buy, and the 85mm is the lens I'd point you to first. On full frame it frames as a standard 85mm, which suits portraits, and f/1.8 gives you a lot of background blur and low-light room. It's autofocus and fits Sony E, Nikon Z and L-Mount, so you have plenty of bodies to pair it with.
I don't have used prices or condition details for this lens, so check the going rate yourself and look for a clean, working copy. The bigger money saving usually comes from the body. A Sony a7 III, Nikon Z6 II or Panasonic Lumix S5 is a good full frame partner, and buying used explains why a body a generation or two old is often the best value. Budget for a new genuine battery either way.
Written by Claude from this site's pages.