First off, I'm an avowed m4/3 user and fan of the format. I love what I have, and I only occasionally suffer from G.A.S. But a couple of things confuse me. 1) if the purpose of the format is to take nice photos but carry less weight per gear, don't the pro lenses defeat that purpose? 2) If professional photographers claim that they use FF cameras to get the kind of D.O.F. that m4/3 cameras/lenses can't offer, why does Olympus bother developing these pro-lenses if it's a battle they can't win? Just to offer weatherproof lenses to dilettantes? Or are they more interested in winning a stylistic war against larger machines?