I can prove this with image samples, if you'd like.
with something similar to this, I guess:
in any case, I can think of a lot of reasons Canon has to manufacture a limited number of these sensors, for example:
* to research data collection and data manipulation processes associated with a high-mpix-count chip
* to research the effects of increased pixel density in DSLR sensors (how does it affect noise and DR? how can we process the data so that they improve with megapixel-density? how dense can we get before diffraction precludes any further detail improvements?)
* to research novel image processing methods, like those proposed by some forum members here in terms of diffraction-control, in-sensor-IS, etc
it's a research chip, just like intel's 48-core microprocessor
In that case, I wonder why they don't do it APS-C or Full frame? Weird