You asked
Sigma 35mm f 1 4 dg hsm art vs sony distagon t fe 35mm f 1 4 za?
Both are 35mm f/1.4 primes for full frame, with autofocus and no stabilisation, so the framing and the wide aperture are the same on paper. The difference is mounts and price.
The Sigma 35mm f/1.4 DG HSM Art is the one I'd point most people to. It fits Canon EF, Nikon F, Pentax K, Sony E and L-Mount, and it's common and cheap used, so it can come with you if you change systems.
The Sony Distagon T\* FE 35mm f/1.4 ZA only fits Sony E. Choose it if you're settled on Sony and want a Sony-made lens. Otherwise the Sigma is the sensible buy. If you're shopping secondhand, buying used covers what to check.
Written by Claude from this site's pages.