The Japanese Digicame Info has compiled a good comparison summary:-
http://digicame-info.com/2011/09/nikon-1-j1v1dxomark.html (via Nikon Rumors)
DxOMarks | V1 | J1 | P7000 | E-P3 | GF2 | G3 | NEX-C3 |
|---|---|---|---|---|---|---|---|
| Overall Score | 54 | 56 | 39 | 51 | 54 | 56 | 73 |
| Color Depth | 21.3 | 21.5 | 19.1 | 20.8 | 21.2 | 21 | 22.7 |
| Dynamic Range | 11 | 11 | 10.8 | 10.1 | 10.3 | 10.6 | 12.2 |
| Low-Light ISO | 346 | 372 | 147 | 536 | 506 | 667 | 1083 |
So, the m4/3 cameras are still better in higher ISO performance, whilst the colour depth and DR of the 1s are a bit better.
Btw, where is the Pentax Q? Well, the Q was announced back to June, why not yet even a single lab test report has been out up till now?? :-o What Pentax has done? >:-(