The Leica 28mm f2 Summicron is a beautiful lens, but if you’ve used their f1.2 Summilux, then you can’t go back to the f2.

When I got the Leica 28mm f2 Summicron ASPH, I was pretty excited. I’ve always loved the feeling of the company’s small Summicron lenses. In hand, they just feel right and perfectly mated to the Leica M bodies they attach to. Indeed, the Leica 28mm f2 Summicron ASPH is very much a tactile experience as it is a godsend of image quality for some. If you’re a fan of muted colors and a cinematic look, then you’ll adore the Leica 28mm f2 Summicron ASPH. But if you want more resolution, you’re best off mating this lens to a third-party camera. 
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https://www.thephoblographer.com/2020/08/11/its-not-a-summilux-leica-28mm-f2-summicron-asph-review/