You asked
Is the viltrox af 90mm f 2 2 evo worth buying used?
I think it's a good candidate for buying used. Lenses tend to hold their value and last for years, so a used copy is one of the easier ways to save money on glass. The buying used page covers the general approach.
The 90mm f/2.2 is a portrait telephoto made for APS-C cameras. On a Sony E, Fujifilm X, or Nikon Z body it frames like 135mm on full frame. It has autofocus but no stabilisation, so it's best for portraits and subjects where you can keep your shutter speed up. If that's what you shoot, it's worth the hunt. If you mostly shoot wide or on full frame, look elsewhere. Check that your body is on the list of supported cameras before you buy.
Written by Claude from this site's pages.