Although the Snapdragon 821 is capable of Quick Charge 3.0 for the Pixel, it looks like Google has elected to use the USB-C Power Delivery standard. I just looked up a bunch of very confusing technical stuff, but the big advantage of PD is use of the data connection within USB-C while charging. ( like from a computer ). I don't think there is very much difference in the rate of charging with PD vs Quick Charge. Rest assured, the Pixels will charge VERY quickly.