Well, this was a short time alone. The GH4 will get a companion very soon! Tomorrow Sony will announce the Full Frame A7s that can record 4K videos too! I don’t know the specs and how bad or good the quality will be. All I know is that it should be more expensive than the Panasonic GH4 and that it’s likely to record 4K at a much lower bitrate and a less good codec (the consumer XAVCs). Also there is a slightly crop mode on the A/s so it’s not even a “pure” FF. I don’t think Panasonic has to worry about that new competition…
More info at MirrorlessRumors.com. MR will also host a live stream event if you are curious to see the new cam.