How many of you have had both what did you like / not like? Here is my take. I would have long ago bought the pana 7-14 for its constant aperture AND really WIDE angle capability. BUT since it didn't take a filter mainly ND or Polarizer I shyed away from it and bought the Oly 9-18 instead. A good lens especially on my old E-M5 body. But I was never a fan of the collapsable design plus the aperture is not constant. Mainly sometimes I find myself cramped in ruins where the 9mm is not quite wide enough. Now that I shoot the E-M1 I'm thinking to switch to a more Pro like ultra wide. But can't make up my mind. Anyone has used both what did you find as pros and cons why stick with one over the other? Thanks for any guidance.