You asked
Is the 7artisans m 75mm f 1 25 ii worth it?
Yes, if you shoot portraits on a Leica M and want a fast 75mm. It opens to f/1.2, which gives very shallow depth of field and plenty of light indoors or at dusk. The trade-offs are real: it's manual focus only and not stabilised, so you'll be focusing by eye and holding steady.
It fits a long list of Leica M bodies, from the Leica M10 to the Leica M11, and it's made for full frame, so it frames as marked on those bodies. If you're weighing whether full frame is worth the extra size and cost for this kind of work, the sensor guide covers it.
Written by Claude from this site's pages.