I have a copy of this lens and have used it on an Epson R-D***** and on a Canon P.
It compares favorably with the early Summilux, but less contrasty than the current Leica lenses.
It produces very creamy images wide open, and stopped down to about f/5.6 it is deadly sharp.
I have no connection with the seller, but can I vouch for this lens.