Canon 200mm f2.8 II USM and 40mm f2.8 working great with Techart EOS-iNEXII adapter with version 3 firmware.
One caveat, I had to use my A7r to upgrade the firmware. My A7rII wouldn't recognize the adapter until it was updated.
I was able to use AF-C and Wide to track moving objects. I don't own a Canon Camera to compare native focus speed, but it seems fast and accurate to me.