hmm, they might have had a metabones with old firmware.
I had Sony a7R for couple months and AF worked with: 17-40, 24-105, 50 1.4, Sigma 85 1.4, Canon 70-200II, and 100-400 so basically all the lenses I had at that time.
It was slow, but it worked.
Hmm. That is good news that you find more canon lense compatible with the a7. I tried the demo last month. But it was a sony demo, so maybe their metabones was not updated. They also were giving me offers to use thier native lens as well. I do love the a7 paired with the sony 55mm 1.8. That is a sweet combo. I also tried out the rx100 iii. That is one hella good point and shoot. However, I could not bear to pay 800 bucks for a fast depreciating point and shoot.