This has been a great lens on both my GH2 and EM5. No IS on GH2 but no big deal, just shoot at 1/100th and AutoISO. But I do like the F2.8 to F3.5 of this zoom. The focus is a bit slow for, say, moving children, but for landscapes and travel it has been good enough to keep me from buying any m43 slow zooms. And other than the 12mm of the 12-35, I don't see that new Pany 12-35 adding much to what I already have. It will obvioiusly focus faster (the 12-35) but only adds another 1/2 stop at the longer end.
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