6D haven't continuous focus for video at all. Its not dual pixel model
As I know, 5dm3 better cause it has build in aliasing filter and other stuff. Look here: https://docs.google.com/spreadsheets/d/16cgnRivbUv7nA9PUlCLmLdir3gXdIN3pqzCNAAybepc/edit#gid=5
btw comparison not 100% actual. Info about write speed, max resolution continuous etc. 6d can record 60+mb/s, 24fps non stop in max resolution or 60fps 2.39:1 CONTINUOUS not problem at all.
As I know, 5dm3 better cause it has build in aliasing filter and other stuff. Look here: https://docs.google.com/spreadsheets/d/16cgnRivbUv7nA9PUlCLmLdir3gXdIN3pqzCNAAybepc/edit#gid=5
btw comparison not 100% actual. Info about write speed, max resolution continuous etc. 6d can record 60+mb/s, 24fps non stop in max resolution or 60fps 2.39:1 CONTINUOUS not problem at all.