I've had both the GX9 and Pen-F. I liked them both, and IQ was very good, but each had quirks that were mildly annoying. Probably worst was that focus peaking on the Pen-F was not accurate. I was puzzled as to why I was having to toss close-up images that should have been in focus. Turns out if peaking showed a spot in focus, the actual focus was a bit behind where the peaking said it was. Was not a problem if using a native lens and back-button focus.