IMHO Canon absolutely needs to make that.If they ever make the magic 1.4x extender that allows for full zoom with the 100-500mm it would be an unmatched lens imho.
It would work for the 70-200 lenses as well.
Other than those PF primes, Nikon would have nothing on Canon.
With this single lens release, Canon will own super-telephoto zooms.
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