Already own the mark 1. The mark 2 goes further with enhanced IS and other features. Easy to manipulate the controls. EVF is easy to navigate settings for your style and preference. I have been using older "four thirds" lenses, along with the MMF-2 adapter. Most results have been excellent. It takes an extra 1/2 second or so for the E-M10 to focus, but it does work.
Overall, a great camera that rivals the big (and heavy) boys from the other manufacturers.