You asked
Nikon z 35mm f 1 4 vs sirui aurora 35mm f 1 4?
On paper, these two are very close. Both are 35mm f/1.4 autofocus primes for full frame, and neither has stabilisation. The difference is mounts. The Nikon Z 35mm f/1.4 fits Nikon Z bodies only. The Sirui Aurora 35mm f/1.4 also fits Sony E, L-Mount and Fujifilm X cameras, so it's the sensible pick if you shoot Sony, Panasonic or Leica, or might switch systems later.
If you already shoot Nikon Z, I'd stick with the Nikon. Its mount is native, and that's the simplest choice. On APS-C, either lens frames like a 52mm, so both suit environmental portraits and street work. For more on where a 35mm fits, see portraits.
Written by Claude from this site's pages.