It would be nice if someone had two of the same bodies and put one of these lenses on one body and a canon L lens on the other body. Mounted them on a bar on the same tripod, and used one hand to release one camera and the other hand to release the other camera, at the same time.
(kind of like checking to see if one boot is warmer than the other. Put one brand on one foot and the other brand on the other foot, and go out walking)
