I'm considering purchasing the Panasonic 100-300 for use with my E-M5, but have a few questions: Are there any issues with this combo? Does it have the same "purplish flare" issue that the Panny 7-14 exhibits with this body? Is it best to turn off the E-M5's IBIS and use the OIS of the Panny lens, or vice versa? If it's best to turn IBIS off, is there a way to have the camera automatically do that by recognizing the lens, or would I have to remember to do it manually each time I use the lens (and then need to remember to reactivate it afterwards)? Thanks!