Many months ago there were rumors that Canon was working on a RF mount 400 mm or 500 mm DO lens, but I have not heard anything recently with regards to DO lenses from Canon. For me personally, a 400 mm DO would be a bit short, but a 500 mm DO lens with reasonable aperture (f4-f5.6) would be a desirable lens.Possibly. But consider that most likely, Nikon came out with those lenses because Canon had the high end (600/4, 800/5.6) and low end (600/11, 800/11) covered.
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