You asked
Is the meike 85mm f 1 8 stm worth buying used?
I can't tell you whether the price is right, since the site doesn't list prices. The lens itself is a sensible buy: an 85mm f/1.8 prime with autofocus, made for full frame, and it mounts on Sony E, Nikon Z and Fujifilm X. It isn't stabilised, so it leans on your shutter speed. It's also the original version, with the SE Mark II and Pro versions since released. The Meike 85mm f/1.8 Pro page is there if you want to compare.
Buying used is how I'd approach it. Check the full Meike 85mm f/1.8 STM page to confirm your camera fits, then read buying used for what to watch for.
Written by Claude from this site's pages.