Can't tell from the EXIF if some of those high ISO photos use that EXR thingie or not. I'm assuming that it didn't, because all the photos are 4000 by 3000 pixels, which in my feeble mathematical/physics/engineering mind is a whole lot more than a 6 mp photo would yield.
Also, what's with the high ISO choice even under good lighting conditions?? Is it sort of like the X100 picking high ISO because of the Auto DR function? I always found that kinda odd. Hence I just leave my X100 at DR100%.
The X10 seems like a nice camera. I think BB should definitely get one. At Best Buy!