The EOS 70D was a big upgrade from the 60D in that nearly everything was better from the AF for stills, performance and live view Autofocus. The Canon 80D just released improves even more on the 70D than ever before by using a truly exceptional AF stills module with 45 all cross type points. This is 1D level performance in a 1k USD price range.
They include a sensor that has Dual Pixel CMOS AF same as the recently released EOS 1DX Mk II which is a 5x more expensive camera. This is in our view the killer feature of the 1DX Mk II and of the 80D as it becomes a true usable video camera with reliable autofocus. Previously unimaginable in either handycams, other video cameras and DSLRs.