I'm considering letting the Oly go and replacing it with a Panasonic 14-45mm f3.5-5.6. Why, because the 12-40 is just TOOOO BIG AND HEAVY. I don't really need f2.8. I've had the the Panny 14-45 before, years ago, beautiful little lens. 'Little'...isn't that what M4/3 is supposed to be all about?