[Brightcolours]

 

I don't know, so I ask: Having PDAF in LiveView is cool and fast, does this also mean quicker response to shutter release? More specific, can you release in LiveView without the usual mirror bouncing up and down?

PDAF in live view with a older Canon EOS camera, like my former 450D or my 6D, does lower the mirror, does its AF thing, focus confirmation beeps, and then you can take the photo. It uses the PD AF sensor and module.

 

With the Canon dual pixel imaging sensors, the imaging sensor can provide phase detection. So you have PD AF without needing the PD AF sensor. No need for the mirror to go down and up in live view and video. 

In video, you can set parameters for the PD AF, like AF speed. The result is very smooth focus transitions without hunting, so actually AF in video which does not ruin the viewing.