... an MP-E AF version to focus stack ...Depth is a function of magnification and Fstop only -the focal length of a macro lens does not change the depth of field in any significant way.
I do agree that a lens that can reach 2x natively is better than one that has a maximum aperture of F2. The Fstop makes me think that this specific rumor is just that -a rumor. Someone's wishful thinking who already owns the EF version.
Better still would be an MP-E 65mm RF mount lens...
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