i have one. will shoot a few hundred frames this weekend and report back.
initial observations:
- very small, surprisingly light, excellent build quality - its solid throughout.
- the bokeh is very beautiful as far as i can tell so far
- the lens is sharp. yes its sharp. it really is sharp. i have no complaints
- there is some CA with the lens wide open, but i honestly couldn't be bothered about it
- with the new lightroom 4.3, the files open very well. quality is there, reminds me of D3X sensor quality files
- color rendition is beautiful. this is of course, a subjective thing.

- focusing is reasonably fast, i'd say on par with the rx100 at the slowest. using single point center AF only.
- the battery is really small. like. really. small. so i bought an extra one
- i see no difference in image quality output through iso 3200 (so far tested) with respect to my D4 and 35/1.4 AF-S @ f/2.