I've been saying for years that Both Canon and Nikon are more concerned about Sony than with each other.
There are a large number of people who see Sony as a premium brand, and will pay more to get one of their cameras.
It has nothing to do with quality or reliability, but perception of the buyers. Certainly, Canon, and Nikon are highly thought of, but Sony is someone who can cut into their share of the market in a serious way. If the market were expanding, it wouldn't matter, but its shrinking.
Sony has been dumping lots of $$ into sensors, and suddenly woke up one day to find their orders cancelled by cell phone companies that have cut production, or are dropping out. Cell phone ownership is saturated, and sales are tanking. The big money in sensor sales has been cell phones, so Sony lost money last quarter on Sensor sales.
Canon is in the best financial position of the three, and they are looking to invest in other areas that are related, but where they can be number one. Surveillance Cameras, for example, where there is a big market for high end equipment by governments, and large corporations who are willing to pay the high price for the best.
Canon is good at milking sales out of older products and turning in profits where others are losing. Don't expect Canon to throw a ton of money into a declining market, they will continue to keep purse strings very tight.