[youtube]http://www.youtube.com/watch?v=jIFwXztcOzA[/youtube] This video very clearly shows how impressive the new Kipon EF adapter is for Micro Four Thirds. It is shown working with the Canon 70-200mm F2.8L on the Panasonic GX7. I might even expect performance to be more impressive on the GH4 thanks to its faster AF engine.