• I've never really understood the claim that that little 'extra' bit in the rangefinder window helps you to 'see what's coming' — so, therefore, the RF has some advantage for shooting action. A rangefinder is about the worst tool for shooting anything that moves, unless you're content to shoot without focusing and rely on a stopped down lens for DOF. There's a pretty big contradiction here. No one (in their right mind) shoots sports with a rangefinder. And, that has nothing to do with the telephoto issue.
And, doesn't the subject have to be moving pretty slowly in order for the photographer to catch it, first, outside the framelines, and then track it into the framelines? Something that moves two millimeters within the viewfinder is really giving you such ad advantage? Versus servo-tracking AF that can allow you to catch a moving subject at F1.2 and not have to rely on zone focusing?
• I've had two M7s and now an Ikon, and have also owned a Mamiya 6 and now a Bronica RF645. I haven't noticed any advantages with low light/slow shutter speed capability with the RFs over well-dampened SLRs like a Contax RX or Aria, and now a Nikon F6. Contrarily, i like having a motor driven camera with continuous drive, so that the second frame doesn't have any effects of pressing down on the shutter release.
• I have the Aria and a Nikon FE2 that are effectively the same size as my Ikon. And, the Nikon 50mm 1.8 Series E is almost a pancake lens, so size isn't really an issue.
• Definitely, the reason why i keep coming back to RFs has more to do with the range of lenses than the body/viewing system. I don't like rangefinders. Someone above said he finds SLR composing more distracting, because too much of the image in the finder is out of focus. For me, it's the opposite. It's distracting to me to see everything in focus, because i then have to mentally 'translate' what i'm seeing into what i'm expecting in the picture. I never shoot at smaller than f5.6 - unless i have to shoot a landscape or somesuch. And, if i am shooting a landscape or whatever, it's so far away from me/the lens that shallow DOF in the viewfinder isn't an issue. There typically isn't that much in the foreground that will even be shown out of focus.
• Blinking. Even with a rangefinder, we're talking about 1/500 of a second for the shutter, and 1/blink of a second for the eye. Even through a rangefinder, i wouldn't bet on whether a blink had been recorded. With an SLR, you may have a suspicion. With a RF, you have a gut feeling Either way, don't you have to reshoot? In 30+ years, i can't remember ever getting a blink on a contact sheet where i wasn't expecting it.
• The picture of the doofus with the SLR and flipflops is moot. There are doofi with RFs, too. Maybe fewer of them, but that's on account of most people preferring SLRs. Besides that, that camera isn't so big anyway. The only people who think SLRs are big, cumbersome, unwieldy, unstealthy are us rangefinder folks. Somehow we get a bit nancy after getting used to small cameras. I used to use a Pentax 67 and a Mamiya RZ67 - both handheld, for 8-10 hours of fashion photoshoots. Now, looking at either one of those cameras makes my head hurt....
• If HCB started in the 60s or 70s, he'd have used a Nikon F, and he'd have made the same types of pictures.