I think the G1X dxo measurements are a bit worrying, looks like Canon still can't make as good pixels as Sony. Seems to perform about the same as the 7D from 2009... but of course you can compete in other ways than sensor quality I guess...Tell me, why G1X should be better, than semi-professional DSLR 7D?
Am sure Canon can do an excellent job with sensors, and we will see it in 1DX model, for example.
Because it is produced two years later. It is the same pixel size, 4um pixels should perform better today than two years ago.
It is not necessary to differentiate the G1X and 7D on the sensor, the 7D is a DSLR with the autofocus, speed, build, interchangable lenses etc.
I would be surprised if they make the G1X sensor deliberately less good than they can, then they could just as well make a smaller sensor instead and made the camera more compact.
But sure, 1DX will be a safer benchmark to look at. Of what I have seen so far I'm a bit afraid that the sensor performance hype coming from Canon on the newer and coming models are more about JPEG noise reduction in digic5 than about raw sensor performance. I'd love to be proven wrong. But if I'm right I can keep my 5Dmk2 longer, so that's kind of ok too :-).