Having been through Epson R-D1, Leica M9, Leica M-P 240, and Leica M-D 262, this last is now my favorite. As makes sense, because I wouldn't have gone on to the next one if I was satisfied with what I had.
"Why?" is the more interesting question.
The M-D has become my favorite Leica M, not just digital rangefinder, because it is exactly what I've wanted: an utterly simple camera with no extraneous features beyond a good meter and a digital capture sensor. It's nice that it has Aperture Priority AE, it's nice that it has both single and sequence capture modes, and that it winds the shutter electrically. Essentially it has just focus, viewfinder, shutter time, sensitivity setting, and aperture—the fundamental tools of making photographs—with no other options and no other decisions to get in the way of seeing your subject. The rest is up to you to figure out, which is fast and quick because it has nothing else to distract you.
The M-D consumes battery very slowly, fitted with a 64G card it can make over a thousand exposures stored as raw before you need to fit another card, and has little to distract you from doing photography. The raw files are pliable, easy to render any way you want. The rangefinder is accurate and sure. The lenses are superb. There's not much else for me to want in a rangefinder camera.
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