While it incorporates a new version of Canon's Dual Pixel CMOS sensor, which has autofocus sensors on-chip, it uses the same autofocus system as the 80D.
The 6DM2 drops the proprietary "AV Out" connection for a more up-to-date USB.
The lock switch has changed, but otherwise all the controls are identical to the 5-year-old 6D.
It still has the cheap-feeling SD card slot cover.
The only change on top is the addition of a button to access the focus-area controls that are in Canon's other current models.
The 6DM2 is the first full-frame Canon camera to have a flip-and-twist display.
The remote connector has moved to the front from the side.
The grip takes two batteries.