You asked
Is the ttartisan af 75mm f 2 worth it?
Yes, if you want a fast, simple portrait lens. At 75mm and f/2 on full frame, it gives you a pleasant background blur and autofocus that's easy to live with. It isn't stabilised, so keep your shutter speed up for handheld shots.
It works best on full frame, such as the Sony a7 III or the Nikon Z6 II. On an APS-C body like the Sony a6400, it frames like roughly 112mm on full frame, which is tight for everyday use. The focal length converter shows the maths.
If you're unsure whether full frame is worth the extra cost for your shooting, Sensor sizes walks through it.
Written by Claude from this site's pages.