Tony Northrup went through all weakest points from the current camera manufacturers. Watch from minute 11.40 towards to hear him talking about Olympus and Panasonic. In his opinion both companies didn’t do enough to implement phase detection autotofocus system on their cameras. Even the best Olympus camera doesn’t do as good as entry-level DSLR when it comes to continuous autofocus tracking.
This is exactly one of the improvments the new E-M1II shoudl bring. Let’s just hope our rumors about that are correct ;)