It's hard not to be impressed by the Lumix GH4. It handles confidently as a stills camera and is an absolute joy for video. As I've mentioned throughout my review, it is not a low light monster: the 1:1 crop for 4k video from the relatively small sensor of Micro Four Thirds means the footage...
4k (C4k and UHD) video; recorded internally; 1080p at up to 200Mbit/s or 96fps for slow motion; Pro-level video options; controls and displays; Weatherproof body with broad customization; Very fast single AF speed.
4k footage looks noisy at 800 ISO and above; 1080p footage uses non-integer crop; Rolling shutter artefacts in some conditions; Still photo quality no better than other MFT cameras; Burst speed can slow to 5-6fps with CAF & focus priority; No phase-detect / hybrid AF; No built-in stabilization,...