I'm using a 5Dmark II and II with a Canon 600mm x1.4 or x2 on a panoramic head.
I use DSLR Remote pro or Eos Utility with scripting to use the live view focus.
Unfortunalely, DSLR Remote Pro, EosUtility and the Canon SDK are not providing a feed back on the Focus. I am uable to know if the focus is set or not!
At this time, i send the focus order to DSLR Remote Pro, (ctrl + f), wait 3 seconds, and shoot (F8). I would like to speed up the process because most of time, it is focused in 0.5s, but for some hard cases (white surfaces withouot texture, sky), it takes 5s or much more to do it!
DSLR answer me there is any feed back in the DSK theey are using, Canon SDK says me the same thing...
I'v got one thing: when it's focused, the camera sounds "Bip Bip". This Bip is not in the speaker connector, not in the usb. You can just hear it when you'r close to the camera...