After years of using either 4/3, or vintage lenses, on my micro 4/3 camera, having to add weight and volume with an adaptor, I got the chance to splurge on a secone-hand mZuiko 12-100 f4 PRO. Finally. It is a hefty lense, and it pretty much weights and measures the same as my usual Zuiko 14-54 II + MMF-3 adaptor (actually, the PRO weights more than the other two combined), but no I have a lovely, native lense, with huge focal range and amazing quality.
Happy as a pig in mud.
On a side note, I am selling some 4/3 gear, the aforementioned 14-54 II, The 50-200 SWD and the EC-20 multiplier. Should any of you be interested, shoot me a PM (although shipping costs from Spain, for the SWD beast, might be a tad pricy).