Hi, did some tests with G2:
Both cameras has a Canon HJ22x. All images G2 are in full detail and x400 no detail. Last image X400 30 detail.
Impressions: G2 has less color depth and X400 has a better color rendition.
Cant match the color accurately, but can work together if you put in separated places and shots.
X400 has more range. Blacker and whiter.
Will upload a horse race with both cameras next week.
Uploaded some images:
Hope this help to see the differences between the two cameras. And see the color rendition of both.
The cameras are in 1080i 60Hz, going through a Blackmagic switcher.