I know this lens is crazy expensive and I have no plans of ever buying it, but I am thinking about renting it for some up close and personal pictures of bears. I am curious if anyone has used it on a Micro 4/3 camera with an adapter and how the focus speed etc. operated. I have a OM-D, GH2, and GX1 to choose from but would use the om-d for IS. Just curious, would love to hear some stories and see some examples.