Just received my GH4. I shot some basic clips on my way back home this evening.
Conclusions: easy as were the gh2 and the gh3. Very good image quality in 4k and a lot more easier than the 1DC to edit.
Update: Juste updated the edit (the previous was finished at 4a.
Basic color grading with Film Convert.
Shot in 4k, edited in 1080p
I will shoot something better this week-end !