Imaging Resource did some initial test of video AF performance of Canon 70D DSLR featuring dual-pixel sensor, and compared it with other DSLRs. The IR team was so impressed by the dual pixel AF performance that they call it a "game changer":
"Overall, we're very excited about the Canon 70D's new Dual Pixel CMOS AF system, especially for video recording. The camera does indeed bring camcorder-like autofocus to the DSLR arena. With the Canon 70D's fast and accurate, full-time autofocus, intelligent subject tracking, low-light AF, and a great touch-to-focus system, serious filmmakers and consumer shooters alike will no doubt welcome its significant technological advancement."