Three cameras I would like to borrow for a day are a Leica M3/M6 and a Holga 120 and all based upon what I have read over the years, the Holga for the craziness and the Leica to see if the hype becomes fact.
I have the M6 and this week I received a lovely M3, 1964 single-stroke (with a Dual range Summicron F2 bought from ZA, which didn't even have the dreaded haze, optically it's damn near perfect condition).
Right now, I am not sure what to say.
The M6 is a little lighter, especially with my Carl Zeiss planar f2.0 (that should set any Leicaphiles off right there, using non-Leica glass on a Leica.....!) , compared to the M3 with the Summicron dr f2.0.
Operation is just about the same, the same is true regarding the crank to wind on the film to the next frame.
Winding the film back again on the M3 is more cumbersome than with the M6 and loading takes a few seconds longer, since you need to attach the film to the spool, which you then insert, as you did with the screwmount Leicas.
No big deal.
Generally they are (IMO) the same camera, 30 years apart, with the M6 upgraded with lighter/different materials and a light-meter.
My M6 feels and operates much smoother than my Voigtländer R3M, and it is also more solid/rugged.
(purists will claim that the M6 is a cheap, poorly built, not a 'real Leica' for some reason, IMO the non TTL M6 is the last 'old-school Leica M', which started with the M3, since it can operate perfectly well with no batteries, later models may not fare as well, opinions may and will differ greatly)
The m3 does feel like it could operate under a much harsher conditions though, because it seems to have more heft and the metal just seems more.....solid.
The Summicron DR f2.0 feels like it was made from 'Krupp Stahl', left over from the war years.....it's glass in a bulletproof steal-barrel, but a smooth, no-slack experience, solid all the way.
I can see where any 'hype' regarding Leicas would come from though, in 1950-1968'ish, when the M3 was produced, it must have been head and shoulders above the competition (and also, in price!).
But competition has a tendency to gain ground, but by then, the M3, M2 and later models were already considered icons I suppose.
Great machines and lenses, incredible build-quality, but not magic and black-art, they are simply very nice tools to use.
As for the screwmount-Leica's, do not forget that every Leicaphile's big hero, HCB, actually only bought his Leica because that was all he could afford at the time(!), he actually wanted a different camera all together and at the time, Leica's seem to have been considered as 'a camera for average joe".
I didn't know that before I saw some documentary online a few days ago, HCB talking about this and that.