The Japanese Digicame Info has compiled a good comparison summary:-
http://digicame-info.com/2011/09/nikon-1-j1v1dxomark.html (via Nikon Rumors)
|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|
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? >:-(