You asked
Is the sigma 35mm f 1 4 dg dn art worth it?
Yes, if you shoot in low light or want people in their surroundings. The Sigma 35mm f/1.4 DG DN Art is a fast, autofocusing prime for full frame, and it mounts on Sony E and L-Mount bodies. It isn't stabilised, so its wide aperture is what helps in dim rooms.
On full frame it gives a natural 35mm view. On APS-C it frames like about 52mm, which is a sensible length for portraits there, and f/1.4 gives roughly the depth of field of f/2.1.
It fits my advice on your first lenses: a fast standard prime is one of the most useful things you can own. If you want a longer view for faces, the portraits page explains why an 85mm often suits better.
There's also a newer Sigma 35mm f/1.4 DG II Art, a 2026 redesign of this lens, so compare the two before you buy.
Written by Claude from this site's pages.