Well, I do not want to sound critical, but this review is in my eyes rather superficial.
Looking at these images, I notice two things:
- you are very far away from what I would define as a proficient B&W photographer, so your claim, that you have "mastered" B&W processing, is in my opinion premature. Perhaps it would have been more useful, to do this one year B&W experiment on film, and learn better how to get the best of it, to have a good yardstick. Recently, there has been an article on the dying art of B&W printing - this is a good place to start:
http://theliteratelens.com/2012/02/17/magnum-and-the-dying-art-of-darkroom-printing/
- secondly, from what I can see, Monochrom has an advantage over colour sensors not only in resolution, but also in tonality, and this you will not be able to replicate with the M240, so your claim is too optimistic, and also because of this, you have sold this camera prematurely
My point of view is, that although experienced photographers can make the Monochrom images look very close to film, it is still deficient in critical highlight rendition. On the other hand, it has superior resolution and great ISO performance, so for somebody who is content with this look, it certainly is a unique tool.
Perhaps the key lesson for you could be, that you are not a B&W photographer, and this in itself can be very valuable, letting you concentrate on what you really care about.