I finally compared the sony xr550 to the canon hf g10 side by side and I can tell u that in very very low light :
1) the canon retains much better colors
2) the canon videos look terrible...they are very very grainy in comparison to the sony
3) the sony colors are not retained
4) yes the canon can see a little better in lower light...meaning the video looks brighter on the canon vs the sony, but the Noise is too much on the canon and much much less on the sony. Colos are more vivid on the canon than on the sony...but again the canon videos are NOT usable...too much noise....
The canon was with :
back light compensation on
auto gain on
the sony was with:
backlight compensation on
low light on
Ws and As = +4
again, I prefer the sony videos even if they are less colored....the canon videos are too grainy..unusable...also if u set up the gain on the canon to a lower value to avoid grainess, the sony videos look brighter..
so again, I own both the camcorders. I do NOT work for any of the companies. I can tell u that sony is better and I think is the KING in low light, because there i very low noise in comparison to canon...what is the point for the canon to retain colors and maybe be a little brighter , but have so much noise ?
I think I a going to return the canon. I am thinking to try the new sony cx700/560 .....but I am worried that is worst than the 550.
Also for the focus....yes the canon can focus better, but it seems that the face tracking of the sony is better.
What I mean is that in very very dim light, u can still see th square around the face of the subject on the sony, while on the canon disappears. The problem of the sony is that , if it lose track of a face in very very dim light, the sony becomes out of focus, but I am talking of very very low light (I had all the light off. I had a very dim lamp that can regulate the intensity gradually fom no light to bright light. So I was going slowly from bright light to no light, decreasing nd increasing the light...) In all the conditions above , the canon was more noisy....
I hope this help.
I wish someone could confirm what I found out...