They're behind on one curve, and it's one with an easy solution (buy publicly available Sony sensors), which they're too proud to do. If BJL is right, Canon may be close to coming up with sensors that do what the Sonys do. I haven't heard of a Canon with Sony-sensor DR yet, but they are a big organization with a lot of research focused on making great images - they are certainly capable of it.
They also have a weird corporate structure where their Cinema EOS division gets to tell their still camera division "reduce video features to protect our products". Many of their competitors (Nikon, Fuji, Olympus) don't have pro video divisions to worry about (Fuji makes broadcast lenses, but not $5000-$10,000 video bodies) - and Sony and Panasonic have taken the attitude "if you get started making movies with our hybrid still cameras, maybe your next purchase will be our dedicated movie camera". They're right up there on everything else - so much of the experience of photography today is whether your camera matches your needs and your tastes, and Canon is a great match for a lot of photographers.
Canons are excellent bodies with a remarkably broad lens range, especially in FF. The difference in sensor performance is only noticeable in certain kinds of photography, and then only if you use very broad tonal ranges or print very large...
I may not be a Canon shooter, but I have proudly printed on Canon for years (I have a Pro-2000 right now, and I love it). They're certainly capable of anything in imaging that they decide to do, and I suspect they have something up their sleeve in the EOS R line - you don't make two gorgeous exotic lenses like the 28-70mm f2 and the 50mm f1.2 for one midrange body...