Alex,one of the best things about the M9 was learning to use Lightroom. I never came to grips with even the file management in Aperture, but maggieo is no slouch with the processing (see her X100 black and whites too) and there are others who get all they need out of Aperture. It now shares the library with iPhoto. Since moving to Lightroom it's tedious to get pictures onto my iPhone or even setting the desktop picture on my Macs.
The one other thing I would say on processing is have a look at the M9 jpegs, black and white. They can look great and I have had some challenging shots where I cannot match the M9's jpeg with any amount of fiddling in Lightroom. I have set the camera to DNG+jpeg fine black and white as a profile with the Zeiss 21 4.5, for which I have coded it 21 2.8 pre ASPH. That coding just about gets rid of the purple fringing entirely. I will probably make the DNG+ jpeg fine the default for all my profiles.