Originally posted by victormeldrew ... high quality pocketable camera for street and casual shooting ... the [GR2] sensor is old and doesn't stand up well to the XF10 ...
Yes, the GR sensor is older. IMO it still more than adequate for street and casual shooting (plus landscape, semi-macro, and many other things). Of course I wouldn't mind an update that handled high ISO better though I don't see a need for 24mp with a handheld, non-stabilized camera. There might not be enough space in such a compact body to stabilize an APS-C sensor.
I have the older GR but I think it's the same sensor as GR2. In daylight I have zero concerns about the sensor. It's a near-perfect camera for street photography. I love the 3 user modes, TAv, snap focus, and other customization that's available. The lens is very sharp. The XF10 can't be customized as well (based on the body design, and what I've read in specs and previews).
Street photography in dim light gets tricky with any camera. You can't slow the shutter too much with moving subjects (unless you want artistic motion blur in every photo). My personal preference is to convert to B&W if I have to take the GR to ISO 3200 or beyond. Here are 2 samples of the GR. #1 is
ISO 10,000 that shows how B&W (done in LR, not SOOC) works at night. #2 is ISO 1000, overcast daylight but I needed high ISO for a fast shutter speed to stop motion. Not bad for an obsolete sensor.