You asked
Best camera for the ttartisan af 85mm f 1 8 neo?
For a lens this size, I'd start with a full-frame body, since the 85mm frames as marked there. The Sony a7 III is a sensible all-rounder, and the Nikon Z6 II is a good pick if you prefer Nikon's mount. If you want something newer, the Sony a7 IV is worth a look.
On an APS-C body like the Sony a6400, the lens frames like about 128mm, which is a tight telephoto for portraits. That can work well if you have room to back off, but it's a different job. The portraits guide covers how focal length changes the look of faces.
Written by Claude from this site's pages.