There has been much debate about the comparison of the Leica CCD based cameras to the latest CMOS M. I got to shoot with the M last March and recently downloaded some M DNG files to experiment again with post processing in Lightroom.
I can can say it would take me a while to develop a new routine to process the new M files compared to my current process. The files are very different.
I'm also not using the Adobe Leica M9 profile nor the embedded M9 profile either. I'm using a third party profile that uses a little less saturation in the reds and blues. Plus the skin tones look better with it. But if I want to boost the colour I will use the embedded profile. I'm on my iphone right now but would more than happy to provide a link to the profile I'm using.