These two cameras are around 10mbps apart in terms of data rate, but in this short I have recently made you can compare qualities nicely. The close shots with wide DOF (and most static shots)were all on the 550D (w/voigtlander f1.4) and pretty much any shot that is moving is the XF100. There not actually that far apart and in some cases with the f1.4 and a bit of sharpening I'd even say the 550d looks better. But of course that higher bitrate is clearly better with handling noise and so on.
http://www.youtube.com/watch?v=tZwxlYCPMmI
Check it out
http://www.youtube.com/watch?v=tZwxlYCPMmI
Check it out