I'm very interested in Bernard's report that the H6D-100 isn't a lot better than the Z7 - that's what I've been unable to compare prints from myself (MF with a huge pixel count advantage). I looked closely at samples from the Z7 and similar-sensored D850 against many full-frame competitors before buying mine, and I've compared against 24 MP APS-C with excellent lenses (Fuji) on my own work. Of course there was going to be a difference from Fuji to Z7, but I was surprised at the magnitude.
The one sample I wasn't able to come up with was 80+ MP medium format (the differences vs. Fuji 50 MP MF, which I considered seriously, were minimal at best). Nobody had an 80+ MP sample at PhotoPlus, nor at my usual dealer, and I didn't make a special trip to find one because I wasn't looking in the $20,000+ price range, nor was I interested in the size and weight of those cameras.
On another topic, I join Kers' interest in a PF telephoto (probably a zoom) for Z-mount. Rumors say that we should be seeing the 14-30mm soon, and a perfect field kit would include 24-70, 14-30 and a compact 70-(something longish). A 70-200 f2.8, unless it's MUCH smaller than the usual lenses in that focal length range, is going to be too heavy to backpack with. A 70-200 f4, or a variable aperture 70-300, would be much better sizes, especially if it's PF...