That surprises me. I left Google for Firefox. Unlike most other browsers, Google refuses to implement colour management resulting in colours that look wrong. Have they fixed it in Google+ or what?
You need to do more research comparing like for like, image quality, build quality, DOF, size, weight and lastly price. You will then realise what a bargain the Zuikos are.
Quite possible and even likely I think!
Really! I would have thought medium format was the professional's choice.