See the latest shootout test conducted by the eZone Hong Kong:-
http://www.e-zone.com.hk/watch.php?type=photo&cat=1&id=1107&documentid=19774
Downsized samples are available for download per picture page, just click on the Chinese words of "下載點" to download. Btw, it is told that he DR test was done at ISO 200, whilst the high ISO test was done at ISO6400.
After all, the tester concluded that the IQ of the new Sony cameras are better, despite that they are only APS-C sized for the sensor, followed by the FF 5D2 and then the 7D, and then finally the m4/3 G3, which comes last. So, it's your take now to judge, and see if you agree with them or not.