Kin Lau said:
The Electro 35 is probably not a good choice for sports. You've got no clue what the shutter speed is except for "Too Slow" and "Too Fast".
Kin, depends what kind of sports. I garee, sometimes a rf is too slow to focus and you can't get close enough etc etc, BUT.
The GSN - and a rf in general - has two advantages as well: You see what's happening out of the picture frame and during the exposure; you don't have shutter lag.
I can show/tell you an example. Two years ago my friends had their yearly beach volleyball tournament, and I was documenting it with an SLR and 135/2.8 lens. While the photos are very nice with a shutter speed freezing all the action, the ball usually went out of the frame before the photo was eventually taken, except one single frame with a half ball at the very edge. Should have anticipated.
A year later (in 2004), i went to the same place, same happening, same people more or less, same weather conditions, but took a GSN with me.
There's motion blur in some of the photos, not disturbing at all, and the ball was always where I wanted to be on the picture, not 1/10 seconds further.
See
here a GSN-made example: motion blur on the feet of the jumbing player, ball right where it should be.
However, due to my framing errors i've cut some feet off (had to get used to the fact that the framelines are the edge of the photo, not the viewfinder's edge).