I'm going to break this post into a short version for people who understand some technical details of video, and then a longer elaboration for people who don't. The short version is this: The GH4 records 4K video internally at 8 bit in 4:2:0. Andrew Reid at EOSHD theorized that it should be possible to downsample this in a way that produces real 10 bit, 4:4:4 data. An alpha version of a tool to do exactly that has now been published. Sample footage is here: http://vimeo.com/91573346 It bears repeating something I said in an earlier GH4 thread: 4K capture doesn't require 4K distribution. There are major advantages to recording in 4K and downsampling to 2K for final output. It's the same reason we have 16, 24, or higher megapixel count cameras. The extra pixels improve sharpness, decrease noise, and produce a better final image. The same applies to video, maybe even more so. Ok, now to back up and explain some of the technicalities. There are detailed articles out there if you really want to know; I just wanted to provide a brief summary here. Human vision is much more sensitive to luminance than color. Video compression takes advantage of this by throwing away half or even three quarters of the color data and interpolating it after the fact. When half the data is thrown away, it's called 4:2:2. When three quarters is gone, it's 4:2:0. Full detail, where every pixel is a full YUV value, is 4:4:4. This has the net effect of smudging color detail, particularly on sharp edges. It ruins color keying and can be a real hassle for color grading. From the EOSHD post: Most of you are probably familiar with 8 bit versus 10 bit; it improves the number of color gradations that can be properly represented by quite a bit. It's very easy to get banding artifacts in 8 bit, where things that should show subtle color changes don't. This is an exaggerated example: These kinds of details are a big reason that modern movies can still be recorded in 1080p or 2.5k and shown on large screens without breaking apart. The raw resolution doesn't sound higher than consumer equipment, but they're recording a lot more data in both color and luminance detail. While a number of consumer cameras can do this, they come with big hassles. External recorders may be required, or they may be recording fully RAW which looks great but consumes enormous amounts of card and disk space.