I think what you forget is the lenses that are available. And for street shooting, I think Fuji is better in this case. Furthermore, the Fuji has a optical view finder, which might give it a plus. And then you have to to think, do you really need all the megapixels? Remember the X-Pro 1 does not have an AA filter, this another plus.
The NEX on the other hand, has a focusing help for manual lenses, I couldn't find anything like this on the X-Pro 1, when I checked it. I also do not know if any of those two can do pre-set for a focus distance, like the Ricoh GR digital can. This is something pretty amazing and takes away the focus time. Wished those kind of cameras would have this setting, at the end it is nothing more than a software and putting the focus on a certain distance.
For ISO, on my X100, at f2, I have to use at least ISO3200 at night, to get ok shutter speed, better ISO6400. But the quality is so good, that it is normally no problem at all.
And weight wise I can agree
Since I have the Fuji X100, I finally have a camera I can take with me everywhere, because it is so light. A canon body + a good lens, just weights too much for every day usage, once you get a bit older.