Thanks, nzeeman, nice comparison. Have an M4, had a 4K or two briefly.
You come out with, conveniently, four ticks for each. The M4 finder is superior in that it has parallax-corrected framelines and the Zorki doesn't. These framelines are also closer to actual coverage than in later Leicas with .72 finders that squeeze in 28mm framelines. +1 for Leica. On the other hand, though the 4K has a shorter base length, its higher magnification gives it a superior
effective baselength.
I much prefer the M4's crank rewind, but knob rewind is something I'd only have to deal with at the end of each roll. Where I think the 4K is a real pig, though, is the trouble you have to go through to change speeds, especially if you're hovering around 1/30. Probably didn't help that my 4Ks had stiff, razor-sharp dials...
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Again, I don't find the removeable baseplate a problem. But you could add that the Zorki has a better tripod socket position, like a normal camera. Like my Nikon F3, which has a perfect tripod socket position until you add a motordrive to it, when it's back at one end, but Nikon has an accessory which moves it back to the centre again...
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One correction. The Leica self-timer starts with a small chrome button that's revealed once you turn the self-timer lever. You can turn the lever but continue to shoot with the usual shutter release button, and the self-timer won't start up.
People who say it is a sin to shoot with it on a Leica are full of it.
Haven't met any actual photographers who say this, but I was once in a posh shop and had an assistant fawn over my M4, only to turn his nose up at the Voigtlander on it.