Thinking about getting the Pana 45-175 because it seems to be the best optical performer in this range. I want a long zoom, but the long end of Oly 75-300 or Pana 100-300 is really soft/nasty and just so-so. Has anyone used the Pana 45-175 on an E-M5? Or an E-P3? Im curious to hear thoughts and see images. Thanks.