I don't follow. I've been a (certified) professional photographer for almost 37 years myself, and I've never used the same filters for B/W as I did for color, except maybe a UV filter. Maybe you intended to say something different, which got lost due to translation?
[Sorry Brett typo I meant to say B&W film.
There has been a lot of technical info written about the MM and it's out there if you are really interested. I personally don't know a B&W photographer that has spent any real quality time with an MM that doesn't prefer it over color conversions. Most of hte hate I read is usually by those that have never shot with one let alone spend a few weeks with it. And it is still the only FF 135 format rangefinder that is a dedicated B&W camera. There are plenty of others out there that feel as I do. If that was not true Leica would have never done a newer version. Plus the idea of B&W being the vision not an after thought.
So the final judgement of someone that actually uses one is I like the original so much that I have no plans of upgrading. Over 2 1/2 years with mine and 30K plus frames I will shoot with it until it dies and Leica no longer repairs it.