Originally posted by Nicolas06 Canon 5D mark 4 and 70D can use any photosite as an PDAF sensor
kinda useless in normal operation as CarlJF stated dual pixel its only available in live view mode, and another disadvantage is that third party lenses and canons older lens inventory will often overshoot the point or even refuse to work which is why canon started making lenses with stepper motors for more precise acceleration deceleration control
its kinda ironic that canon has developed the best AF system, for mirrorless operation, which is why samsung are using it in the s7