Canon used the same Sony sensor as the Sony RX100mk3 in their new G7X.
This to me is a sign that perhaps they are realizing the shortcomings of their sensor design team and are willing to try to make a partnership with Sony. I don't think that would be good for the industry as it will limit competition. Sony sensors are used in Pentax Olympus, and Nikon cameras. Nikon does some sensor design and work with others such as Toshiba and Aptina.
Canon used to rule the world with sensor design no one else could get close to but they haven' really progressed much in 8-10 years. No one could afford to make FF sensor when Canon started, no one had reliable CMOS tech or could reach the same noise floors, and they always bumped resolutions above the competion while maintaining best in class IQ.
Nowadays Sony, Nikon (with Aptina), Toshiba, Panasonic, samsung, Fuji all make sensors that are years ahead of canon in terms of ADC noise.