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Interesting question, CDAF has always been very accurate, is on sensor PDAF likely to be the same?
The answer lies in another question: does the CDAF assist the PDAF in all circumstances?
We know how fast this AF sensor is by virtue of videos, what we don't know is how it will perform when stressed; can it track motion, can it AF in the dark? We don't know how sensitive those PDAF sensors are yet; they work like the real thing, but they're obviously not the 'real thing'. There are limitations to the design that must be there, that we have not exposed and therefore cannot account for. And they may not matter at all in realistic situations, of course.
If Canon did it right, and I'm suspecting that they did given the air of confidence that the very measured hype radiates, they have something very unique on their hands. And if they got the sensor shined up enough to put Canon back in the crop game, doubly so; we'll go from Canon doing their darndest to sell Nikons and Sonys with their crop system non-improvements to garnering every recommendation over night- it will be, if they succeed, either 'get the 70D' or 'wait for the Rebel/7D II with the 70D sensor' versus 'go buy a D3200 or a Nex 6'.