So here is how I got 4K from my 7D Mark II and why. Be warned, it might not be what you think.
After watching this video, 4K Video - is it worth it? from LinusTech (see disclaimer *), I learned that whenever Youtube sees a 4K file being uploaded, it encodes a 4K version at a much higher bit-rate than it does any of the other versions (makes sense). Higher bit-rate means less compression, and since most viewers are not going to be watching my videos on 4K monitors (yet), and if they have the internet speed to handle 4K, the higher bit-rate will result in a better viewing experience even if the video is being scaled down to their monitor size.
So I immediately followed LinusTech's recommendation and applied Red Giant's Instant 4K* effect to my 1080p timeline and exported a 4K version to upload to Youtube.
I've worked with 4K from the RED Scarlet and I'd much rather work with the "real deal." But until my budget allows, you might be seeing more 7D Mark II "4K" videos.
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*I do not endorse or approve all of the comments made in the video or related content. Use discretion.