240 fps and continuous AF
...it does so at the price of accuracy and operates at this frequency only in AF-C mode. -Norm
Reviews say the Oly reads the sensor 240 times a second. IIRC the GH2 is only 120.
We are getting close to the point where C-AF theoretically can match a PDAF camera. Of course that depends on what the camera does with those sensor readings, and my bet is the logic is not there yet. Lens motors have to bet very precise to in order for this to work.
I'll be curious to see how the new camera does.