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,...

My footage had a very faint vertical blue line flickering from top to bottom on all mp4 footage but only in 4K. I changed all the settings that I could think of that might be causing this. Nothing worked. Then I came across the video mode for MOV as opposed to MP4.

The Panasonic Lumix DMC-GH4, which is a mirrrorless camera using a Micro Four Thirds (MFT) sensor, has nearly the same body design as the GH3 with only minor differences in overall dimensions.

Very good M4/3 camera which I enjoyed using for almost a year, until switching to the Olympus EM1. The reason for the change was Panasonic has image stabilization in their lenses and the Olympus has it built into the camera, which for me was an advantage at the time.

This my third GH4. I primarily shoot classical music concerts and operas/musicals with locked off cameras, so having a camera that stops recording at 29 mins 59 seconds, is not an option for me. Lighting is not normally an issue, so f/4.0 at 640 ISO covers most of my theater shooting needs.

A quantum leap for amateur video production, and a superb stills camera to boot