[Klaus]

This is invalid argument as DSLR lenses are designed to work  with PDAF only. The lenses for mirrorless cameras are designed to work with hybrid AF system, and there is no reason why hybrid AF with newer lenses can't eventually perform better than DSLR 

 

We aren't talking about lowlight AF but AF tracking so all your other arguments aren't relevant here

 

Canon STM lenses are meant to work with CD-AF. 

 

The CD-AF has advantages as far as accuracy is concerned. I am not aware where this has benefits for AF speed.