Android accounts for one-quarter of mobile web traffic
Android is mopping up Apple and RIM's declining mobile mindshare in the US, you'll find nothing but corroboration from Quantcast. The analytics firm reckons a full one-quarter of mobile web traffic stateside comes from devices running Google's OS
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This system let you have faster autofocus on cost of the quality of the light. less light to the sensor will mean more noise in the eventual video recordings. The other option is slow autofocus and full quality
Sonys system implies a mirror-viewfinder which means you will not see it in the current implementation in higher end models. It also uses a dedicated (smaller) sensor which means you have a different depth of field than what your photo will have. A video would maybe benifit from the smaller camcorder-sensor in terms of speed but suffer in terms of depth of field control.
So all three systems have drawbacks and are not perfect.
The perfect solution would be to make a sensor that does phase detection as well as image capture. if that ever can be combined. Or that computer power increases to a point contrast detection speeds up at par with phase detection.