Next up will be this lens on the M Monochrom. I ended up calibrating it for the M Monochrom with an Orange filter. I marked the original position. I suspect the lens will be best at F1.4 on the M9, and wide-open with the Orange filter on the M Monochrom.
I want to see how the lens sharpens up on the Monochrom. Just a quick test- more to come.
Some very careful tuning for the M9: looks good from 0.8m to infinity. This lens pushes my ability to focus. After a lot of re-assurance using the display after several shots, I'm leaving it set for the M9. I'm also noting the lens does much better at F1.4, sharpens up and has more contrast than wide-open. This lens also exhibits a lot of field-curvature, focus at the edge is closer than the center. I'm used to that with my Sonnars.
This lens is sharp enough wide-open across range. Getting it calibrated perfectly for your camera will take a couple of tries: but it is worth the effort. $450 for this lens is 1/2 the price of the Voigtlander 75/1.5, and less than the price of the 75/1.8 used. It's less than the Tax in Virginia for the Leica lens.
This lens is a bargain at under $500. I find it to have plenty of contrast, sharpness, and light-gathering power. If you are using it with the rangefinder, as I do on the M9, calibrating the cam to the specific camera is going to be necessary. This is easy to do- takes a little time and a couple of iterations. It is well worth the effort.