I currently have a Canon 1.4x first generation, and also a Kenko 1.4x 300 DG. I've found that the Kenko is slightly better than the Canon 1st generation.
I use extenders mostly with the Canon 70-200 f4 IS L lens, and have been using the Kenko mostly.
I know that the electronics of the new Canon 1.4x will not give any benefit over my current extenders, but will the optical quality be better?
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