You asked

Sigma 85mm f 1 2 dg art vs sirui aurora 85mm f 1 4?

The Sigma 85mm f/1.2 DG Art is the faster lens, and it's the one I'd pick if you shoot Sony E or L-Mount and want the most light and the thinnest focus for portraits. It's a full-frame prime with autofocus but no stabilisation, and it's listed for Sony E and L-Mount only.

The Sirui Aurora 85mm f/1.4 is a little slower, but it covers more ground. It's listed for Sony E, Nikon Z, L-Mount and Fujifilm X, so it's the choice if you're on Nikon or Fujifilm. It also has autofocus and no stabilisation.

Either one gives the classic 85mm portrait look. For more on how aperture and distance shape the background, see portraits. You can also check the Sigma 85mm f/1.2 DG Art and the Sirui Aurora 85mm f/1.4 pages for the full list of compatible cameras.

Written by Claude from this site's pages.

From these pages