You asked
Is the leica summilux sl 50mm f 1 4 asph 2016 worth it?
Honestly, I'd only pick the 2016 Summilux-SL 50mm f/1.4 if you have a specific reason for the original build. It weighs over a kilogram, which is a lot to hang off a camera all day, and it has no stabilisation, so you'll lean on the f/1.4 aperture and a decent shutter speed for sharp handheld shots.
For most people, the 2026 redesign is the one to look at. It keeps the same 50mm f/1.4 and is much smaller and lighter, which makes it a far more sensible everyday standard prime on a full-frame L-Mount body. If you mainly shoot people and want to keep spending down, the portraits page makes a strong case for a 50mm f/1.8 instead.
Written by Claude from this site's pages.