You asked
Nikon z 85mm f 1 8 s vs ttartisan af 85mm f 1 8 neo?
On paper these two are close to twins. Both are 85mm f/1.8 autofocus primes for full frame, neither has stabilisation, and they frame and handle depth of field the same way. The real difference is mounts. The Nikon Z 85mm f/1.8 S is made for Nikon Z bodies. The TTArtisan AF 85mm f/1.8 Neo also fits Sony E and L-Mount cameras, so it's the one to consider if you might switch systems or already own a Sony.
If you shoot Nikon Z, I'd go with the Nikon for its native fit. If you're on Sony or L-Mount, the TTArtisan is the only one of the two that works for you. This site doesn't compare their image quality, so check independent reviews before deciding on that alone. For why an 85mm suits portraits, see portraits.
Written by Claude from this site's pages.