Thanks so much, Kurt; I appreciate your taking time to elaborate.
I currently use the M8.2, deciding against the M9, as I prefer the b/w output from the former. I, too, use LR for processing, although I have no experience with EFX2. (Any quick comments, if that's even possible for a non-user, on what controls allow for 'more structure' is welcome.) The print is always my goal, so I focus quite a bit on workflow beyond LR...papers, profiles, printer settings, etc.
I was a film user for decades, having built multiple darkrooms over the years for b/w. I've been tempted by the MM, but frankly have gotten spoiled by not having to use lens filters (other than the UV/IR filters that just stay locked in place for my M8.2), as well as being able to use color channels in LR for my PP. In addition, although I don't rely on screen shots for my camera evaluation (preferring to make my own prints with my own pics), much of what I've seen online has been lacking for me. Your files, though, are closer to what I like to see, so that makes me rethink the MM's capabilities and whether I ought to rent an MM for test.
In the meantime, my next objective was to test the new M. IQ, both b/w and color, will be paramount, and if that holds I welcome the weather sealing, quieter shutter, faster processing and longer battery life, 2m frame lines and the possibility for longer lenses. But none of that matters if the IQ isn't sufficient for my needs and preferences.
Now you've gone and complicated my thought process.
Jeff