Excellent. Exceed all expectations. Works great with A7R2 and Canon long glass.
Using on A7R2 camera. Have Sony's 35f1.4, 85f1.4, 16-35. Have also used Sony's 70-200f4 and Sony's 100-400, but find no need to purchase these given how nice Canon's 70-200f4 and Canon's 400f5.6 work with Sigma MC-11. The Canon's 70-200 becomes stabilized, works great down to 1/20 sec @ 200 mm. These are shutter speeds, that were newer an option on the original Canon bodies that i had before. Tracking speed, precisio. And object recognisition and following is excellent. Well above Canon's xxxD level of cameras and in line with 5d m4. This is far beyond what i was expecting from adapted glass. Focus precision is exceptional and keeper rate due to focus precision and addition of in camera stabilization exceeds that of my previous 5d Canon which was already very close to 100%. Some caveats, which are more of a wish list - farr edge focus points are less active at 200mm, but this might be Sony's focusing algorithms which at these focal lengths are giving more priority to center of the frame, which is the preferred approach in most cases anyways. The 400 f5.6 appears to be slightly slower than on the canon 5d body when focusing close to minimum focus distance, at longer focusing distances the performance difference, if at all, is negligible. The lens also becomes image stabilized (which in Canons stables would cost me a thousand more) and can be hand held down to approhimately 1/120. The gain from in body image stabilization is less dramatic than for the 70-200f4, but still 2 stops for 400mm lenss of additional headroom. For action 1/120 anyway is borderline slow in most cases. Also, edge focus points appear no to get much of priority, but subject tracing is very good at 400mm and focus precision without any focus calibration (newer liked it much on Canon) is excellent. The adapted Canon's 70-200 f4 is indistinguishable from Sony's f4 zoom whit exception that eye focus and flexible focus are modes are inactive. Eye focus needs to be done the old Canon's way - with a precise focusing on eyes of the subject and this actually is not a downgrade when compared to the Canon in viewfinder mode.
Firmware version for MC-11 is 1.11.
When moving to Sony, was not expexting to have such a positive experience, including with the adapted glass. In conclusion - exceeds all expectations; the adapted lenses work very much the same as on 5d Canon (real surprise to me) just with added benefit from in camera stabilization.
P.s. Canons 85f1.8 works also good, but this will be sold, as at 85mm focal range i can not live any more without eye focus (don't undervalue the convenience of this) and thus i have already bought 85f1.4 Sony.
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