You asked
Sigma 85mm f 1 4 dg hsm art vs zeiss batis 85mm f 1 8?
Both are full-frame 85mm primes with autofocus, and both make excellent portrait lenses. The choice mostly comes down to mount and aperture.
The Sigma is the faster lens at f/1.4, and it's the more flexible one. It fits Canon EF, Nikon F, Sony E and L-Mount, so it will follow you if you ever switch systems. It isn't stabilised, so it relies on your camera's body stabilisation if it has one.
The Zeiss Batis is f/1.8 and only comes in Sony E. It is stabilised, which helps when you shoot handheld in dim light. If you already shoot Sony, such as on a Sony a7 III, it's a sensible choice.
My advice: take the Sigma if you want the extra stop of light or might change systems. Take the Batis if you're committed to Sony and want stabilisation. For other options, see the lenses for portraits.
Written by Claude from this site's pages.