This is worth a read, a whitepaper from Canon.
http://www.robgalbraith.com/public_f...hite_Paper.pdf
I do not know if there is an update.
I do know that Canon is the only manufacturer that does not fiddle with the RAW data like some others to reduce noise. This inevitably results in faint detail being lost such as faint stars that look like noise.
Canon also makes sure that the Silicon is ultra pure so minimising hot and warm pixels. They control all stages of the fabrication of their chips.
Where do the other manufacturers get theirs from?
Bert