As much as would love to have a Leica, the idea of going back to manual focus is too daunting, and for my applications, too slow. I already moved away from DSLR partly because the constant challenge of having to re-calibrate bodies and lenses combos every time I upgraded one or the other was eating into what little leisure time I had. So, an auto-focus solution - well, it would have to be small, but deliver a good compromise on IQ and high ISO without being bulky. And it would have to be a well-established ecosystem of lenses and bodies. My current system still checks those boxes - Fuji. What Fuji doesn't do as well as my old Nikons is flash. One compromise of moving to mirrorless is the loss of functionality on any Digital-compatible flash of the IR illuminator, which works at longer ranges, is less obtrusive and more accurate than any white-light AF illuminator. So something like the Fuji, but with flash like Nikon. The search continues...