I emailed Metabones asking if they could produce a ray diagram to tell if the 17/24 TSE's would have issues with their mk3 adapter on the A7/r and they would only say the lenses have not been tested (no surprise).
I wondered if Brian Caldwell might have some insight as he must be pretty familiar with the e-mount and thought he might be familiar with the Smart Adapter (even though his SB is very different). In any case this was his answer which I posted over on Lula. Not ruled out but not very encouraging.
Sony A7R adapter for Canon EF-mount?
"It seems to me that the E-mount is a really poor choice for a full-frame mirrorless due to the extremely small throat diameter. Whether this has a visible vignetting impact on lenses with large exit pupil distances and shift lenses remains to be seen. I think you might see some abrupt corner falloff with the 17/24 shifted to their maximum values, especially if you shift along the short side of the frame. I don't think the Metabones glassless adapter would have any impact on this - its just inherent in the geometry of the E-mount.
However, we won't know for sure until somebody does an actual test."