There are four reasons for the film Leica successes in photojournalism and art photography:
1. Easy (fast) to use
2. Sturdy
3. Excellent lenses (microcontast not least)
4. A viewfinder that shows also what is outside the frame. (re-compostion until the exposure is made)
Sorry, but I think this list leaves out the most important point of all, and one that gets overlooked almost constantly in threads I've read. The Leica, and any rangefinder, gives you the ability to shoot at minimum aperture without viewing the frame at "wide-open" depth-of-field. Shooting at so-called "
hyperfocal distance" is a style and look- a way of seeing, if you will, that is unique to rangefinder shooting- and most commonly Leica. It has made a huge contribution to the history of photography, and photojournalism in particular.
My favorite example is
Costa Manos' work, American Color- OK, also because he's a friend of mine, but he's a Magnum photographer whose style evolved because he shot with a rangefinder, and could visualize the frame without the SLR full-aperture viewing- something I've always felt is a disadvantage of SLR cameras that never gets mentioned.
I've shot with a rangefinder from the very beginning, and though I did shoot with an SLR later on, my reaction to the "you see what the lens sees" line was, first, uh, no, you don't, and second, so what? LOL
I just put the final touches on my M8 review and this point kept coming back to me... there are numerous threads talking about "digital rangefinders" and the lack thereof- but nobody talks about this... interestingly, composing on an LCD that gives you a focus preview, like the E-P1, accomplishes the same thing, but by taking the SLR to the next level- by seeing what the sensor is actually going to see, we get the view of the lens as well as the actual depth of field. One reason I get so excited about the LCD as a viewing device- the best of a groundglass with none of the limitations.