I shoot the Q3 43 and Q3M side by side.. I always loved the HC BW out of the Q3 28 and 43, but after shooting with both, you really get an understanding of the monochrom sensor tonality. The Q3 b/w JPG's just come out so much more "crunchy". Obviously a lot of that has to do with 8-bit JPG, but for me, the difference is pretty significant, even when editing raws. Big fan of what they've done with the Q3M.
Anyways.. Palm Desert Air Museum a couple of weeks ago with the Q3M. Got lucky with some desert rain clouds in the background..