The Panasonic Lumix DMC-GH4 puts together a solid stills shooting feature set, including a 16MP Four Thirds sensor, 2.36m dot viewfinder, fully articulating 3-inch LCD and 12 fps continuous shooting. But its headline specs are in the video category - Cinema 4K recording and a host of tools for video shooters like focus peaking and zebra settings. We put its capabilities in stills and video to the test.