Yeah I was interested in the viewfinder magnification for composing. I like the Leica LTM camers but wish that their viewfinders were less squinty. My contemplation is in getting a IIIg or an M3. I currently use Canon 50mm's and don't really care about other focal lengths, but M lenses, maybe.
I have a M3 - get one, it is a joy to use! Loading of the film is much faster and better in M3. Probably when you get used to it - screw mount loading is not painful also, but for me it was. M cameras are faster and better for shooting. Screw mount cameras are smaller and more pocketable - but not IIIg - it is big almost as M3.
@taysirco - yes rangefinder is 1.5x but viewfinder is 0.7.