During the Jan Leica Academy course that I attended we had a chance to get our hands on some cameras like the Leica SL2 and more interestingly the M10 Monochrom. The lack of noise at very high ISO settings is remarkable. Great greys. What I noticed again, when shotting wide open I was again struggling to pinpoint the focus at times using the optical view finder.

ISO 12500

100%  crop. I cannot grumble here. Looks like some good old fashion grain to me.

Did not had too much time basically 10min spending inside in the Leica Academy building