The whole discussion about composing carefully in the VF is probably best left for another thread, but since we're talking . . .
I love using the Bessa cause of the nice big VF. My Canon 20D doesn't seem as much fun now, although that can change in a week. I also had a VERY small Sony P&S P100 and I could never get used to using the LCD or very small view finder. It had like no shutter lag, but somehow I enjoy using the Bessa on the street more than the Sony. The Canon feels entirely too large to walk around NYC with -- the VF is dark compared to the Bessa.
I agree capturing the timing of the shot sometimes is more important than the framing. That's why I got a digital SLR two years ago -- I couldn't stand the shutter lag on my old digital P&S. SLR's let you snap when you want to. I also cropped as I saw fit on my computer. But since I don't develop my own stuff I need to be more careful about composing in camera.But the big bright VF on the Bessa helps me see the shot a little better.
P.S. Oh and did I say I'm a total RF beginner. After getting the 50mm Nokton on with just a little too many tries, I can't get my 35mm lens back on. The threads just don't seem to engage. What am I missing? They're gonna bar me at PhotoVillage.