Yes, the 5D IV and R. But what about prior bodies? For years, Canon was ‘behind’ in sensors...but not in sales. That was my point. You say they ‘need to be close to Sony’, the facts show they don’t.
Got any evidence of a ‘slow but steady bleed to Sony and Nikon professionals & semi-pro amateurs’? Note that anecdotes ≠ evidence. “My two friends who used Canon have switched to Sony. Well, one switched and one is thinking about it,” is not evidence. “This or that pro shooter switched to Sony,” is not evidence (any more than, “That other pro photographer switched to Canon.”).
In point of fact, if the ‘low end of the market is collpsing’ making the high end that much more important for overall sales numbers, and Canon is not losing market share, that is a form of evidence. Except that it’s evidence which refutes your argument.