Since I've just updated the Fuji's firmware which stops the chattering aperture blades and since there is a suggestion that if you press your finger firmly through the shutter button the cameras AF is quicker, I decided to give it a try with the camera plus 35mm f/1.4 lens.
My frustration with the camera is that it isn't consistent. When it did work quickly and when I wanted it to, like the shot above, I got the picture I wanted, But too often it dithered about, and sometimes wouldn't take a picture at all, so I missed a lot as well.
When there is time to think about whats going on, its fine. I changed location later on, to a less crowded environment and it was much less problematic.
To be honest, I did enjoy my first attempt at this style of photography enormously. I discovered that I had more "bottle" than I thought I would and the people watching and anticipation involved was quite exhilarating. However, I'm not sure that I'd use the Fuji again. I've resolved to try this more often, and I'm taking the OM-D next time.
So, I can't say that I recommend the Fuji X-Pro 1 for fast reaction photography in a crowded constantly changing environment. Try as I might, I couldn't get it to do what I wanted, and I tried virtually everything to see if I could get it quicker, but failed. There was no question that the quality was incredible, Most of these pictures are blow-ups from images shot at ISO 800 and you see the quality for yourselves.
I'm going back to using it as a landscape / location camera with manual focus lenses, as that is where it seems to excel. I was editing some images I took a while ago with it yesterday, and there was a wonderful quality to the images. I had taken them with my Voigtlaner 35mm f/1.2 Nokton lens, which after a lot of experimentation seems to give the beat results. However the disadvantage of this combination is that it weighs close to a Kilogram.
For my next foray onto the streets I will try the OM-D and I'd also like to give my NEX-cameras a go. When I do I'll see if that improves things.