Is M4/3 being left behind ? Features-wise

Nikon, Pentax Q, NEX, Canon EOS-M... all share one thing in common: they don't have jack for native glass.

M43 AF is pretty decent right now, lightning fast with the newest lenses. PDAF on sensor should be here by next fall, giving better C-AF, but otherwise, the Canon and Sony implementations of PDAF on sensor haven't been particularly speedy.

Which leads to a real 'duh' moment: Exotic AF schemes aren't of much use if you don't have lenses worth AF'ing.