I recently exchanged my Panasonic GH4 for for the Olympus OMD-EM1.
Since Video is not my forte it was a wise decision ,,
The Olympus OMD-EM1 has no low pass filter so out of Cam shots are pretty sharp image wise quality.
Although this camera is a bit dated released Aug 2013 it is not much behind the Gh4 released in early 2014.
Another part of my Camera arsenal is the Panasonic GX8 which cut down my parting pain with the GH4..
I did a test with some yard Birds with the Olympus with cloudy conditions and it did pretty good,although I still have to work on the settings which are totally different from the Panasonic models.