You asked
Is the sigma 35mm f 1 4 dg dn art good for street photography?
Yes, I think it's a strong street lens, with one caveat: how well it works depends on the body you pair it with. On full frame it frames as a classic 35mm, wide enough to show a scene and close enough to feel part of it. f/1.4 also helps in dim streets and evening light. It's autofocus, but it isn't stabilised, so keep your shutter speed up.
My street advice is to pick a body that stays unobtrusive. Our street guide puts a small, quiet camera ahead of extra megapixels. If you go APS-C, the lens frames like 52mm, which is a lovely street focal length too. The sensor guide explains why an APS-C setup is often the better everyday choice. Fitting options on this page include the Sony a6400, Sony a6600 and Leica CL.
Written by Claude from this site's pages.