Color is very different if you go with the manufacturers profiles and curves, which I think most actually do. If you make your own profiles they will match up well of course.
From what I've heard Hasselblad is quite good at keeping the same basic look across cameras with very different sensors, thanks to profiling. So if one like Hassy color, one will like the CFV-50c. The CFV-50c uses the same profiles as H5D-50c.
The great opportunity with the CFV-50c as I see it is use on tech cams, where the lenses will be the same as for any other Sony CMOS back at a much lower cost than the alternatives, even now when price is back up at $15k.
Over at getdpi there are some images posted.