Sorry, but I missed the question first time round.
Frankly, the differences that people report seeing in colour between different cameras are almost entirely a function of the camera profile and post processing (or in the case of JPGs, the camera's in-built JPG engine.
I wouldn't consider choosing a camera or a sensor based on its "colour rendering". Dynamic range, resolution, and noise are IQ characteristics to consider. Colour rendering is so easy to alter or adjust that it's the least important when considering a sensor's capabilities, to me at least.
Michael
And that's the thing, really: where there are few constants, as in digital processing, it must be impossible to arrive at meaningful conclusions about quality. With film, where the variations between lenses/cameras could be tested, in many cases, on a single cassette of film, it was fairly simple to see which exposure was the more attractive for whichever reason was driving the photographer.
A challenge would be taking the same RAW file off the card, and seeing whether or not a new, blind, development of it would give you the same result every time you were to do it... I would suggest not, so devoid of constants, how can anyone compare?
Loved the lightbox. Still have it since 1966; Kodak did make some great stuff!
;-(
Rob C