7A 50 1.1 is sharp in the middle. They say it never gets sharp in the edge of the frame. But it might be variable from copy to copy.
Thier 35 f2 has some odd distortions, sometimes. And thier 28 1.4 flares, but they should have later, improved version.
Here is nothing too complicated to adjust it for film, it just takes time and film to verify.
It's not anything I would spend money on for a Leica. If I was shooting mirrorless digital, maybe . I have a beautiful Summicron 50mm 6 bit, I bought it used mint from a Japanese dealer, I think it's about 5 years old. For my 35mm lens I have a Cosina made Zeiss ZM 2.8. They call it a Biogon. It's so compact and sharp wide open . I paid close to 900 bucks for mine, but during the holiday sales you could buy one for 700 usd.
The China made lenses come with instructions on tuning the focus, I think that's more of a digital thing. Not something I want to mess with.
For me I want fast primes to be able to see with a DSLR or a film SLR . I hardly ever shoot wide open, except with that little Zeiss cutie at f 2.8
Leica Summilux 35 and 50 were 1.4 during film only era and they were in production for decades.
I have Jupiter-3 it is 50 1.5 LTM, small lens. Not Cosina Zeiss "small". It has 40.5 filter size.
For small and sharp at f2.8, here is Cosina Viogtlander 35 2.5. Not Zeiss "small" even more, filter size is 39.
It is 400 usd on any day. And not prone to Zeiss wobble.