You asked

Sigma 85mm f 1 4 dg hsm art vs zeiss otus ml 85mm f 1 4?

Both are 85mm f/1.4 lenses for full frame, so the choice comes down to how you want to focus and which mount you own.

I'd go with the Sigma 85mm f/1.4 DG HSM Art for most people. It autofocuses, and it fits Canon EF, Nikon F, Sony E and L-Mount, so it works with more camera systems. The Zeiss Otus ML 85mm f/1.4 is manual focus only. It's made for Sony E, Canon RF and Nikon Z, so pick it only if you shoot on one of those and are happy to focus by hand.

If you're mainly shooting portraits, either one gives the classic 85mm look. See portraits for how to frame with a lens like this.

Written by Claude from this site's pages.

From these pages