The boost in readout speed in the newest APS-C sensor from Sony comes from the move from aluminium to copper wiring. Likely the full frame sensors can benefit in a similar way. Fuji uses Sony sensors, so Fuji will be behind if Sony is behind, on sensor tech. Sony to the best of my knowledge, is not behind on sensor tech. Note also that Panasonic has not got phase detect AF.
In practice the AF on Sony works well, and -1 EV AF sensitivity has caused me no practical problems. The real challenge lies in the absense of a separate AF point selector rather than AF sensitivity.
Sony's challenge isn't what's inside the cameras, but rather the external user interface of their APS-C cameras.
The menu system should be totally revamped with a touch screen interface like the Hasselblad X1D. This does apply to all manufacturers, since not a single one of them have a really great menu system.