Easy, those who care to actually use one heavily for video will see the light.
Both 5div's 4k files as well 1080/60p look stunning and nearly in auto (TV, shutter 60, +1/3 stop, standard profile) that's it, forget color grading, incredible low ligh colors. The best color response combined with AWB-W I have ever seen on any camera simply by using Standard, Landscape, Natural or Faithful profiles. It never overheats. Great battery life, peerless video AF - no manufacturer comes close right now, you can not rely on Sony C-AF in low light - it's not even worth comparing. It is just great for family, vacation where you can use single camera with same lenses and your videos will have same look as your stills.
In short: colors, DPAF, AWB-W, EF-mount. You absolutely do not need STM lenses; 50L with its USM peoduces buttery smooth cinematic follow focus - but you have to use external mic as its motor is too loud.
Transcode mjpegs to H264 at 100 or 150 mbps and you are all set. It's such a small price to pay compared to fixing color, tonality, WB in post, not to mention junk footage due to AF or overheating madness which results in very noisy stills even at low ISO settings, or never ending battery management, etc. Watch out for 5div revolution with upcoming tv, hollywood productions using 5div and 1dxii heavily on sets - no, you won't be seeing Sony and Panasonic consumer cams on any of those anytime soon. At that point, this thread will become moot.
It's never the ultimate resolution or even sharpness that matters. Most important - the look/rendering, accurate focus, colors, etc. resolution and sharpness are very distant second, especially for family use.
I have used pretty much every system out there except Fuji. And as much as I like Sony's XAVC codec and use it with my RX100 V all the time, 5div video looks simply much better than a7rii (incl. in crop) with very little effort. I have no reservation lending my 5div to family members and direct them to C1 preset for video and shoot away - with zero knwedge about video. Touchscreen DPAF is dummy proof. GH4 (haven't tried GH5) has entirely different look to videos and stills with supbar tracking and I consider it a very niche product. I neart always shoot my video wide open so consistent focus is very critical.
Yes, there is the inconvinient 1.74x crop in 4k which for me is an issue only when I wish wide angle but for those less frequent moments I switch to 1080p and then upscale in editing.
If you are mosty interested in landscape for both video and stills, Sony cameras are more appealing, IMO. All of my footage includes people.
USABILITY. iPhones don't have to the best in anything to be the greatest.
There is a lot of talk these days that maybe 4k doesn't matter and 1080p is good enough. In reailty, it is only true if you use something like Arri Aexa or Red to acquire 1080p footage. For consumer products, 4k looks way better on 65" screen, in part, due to improved colors not just resolution which is less obvious from a distance. For precious durable family memories, 4k is near mandatory these days, IMO.
Tom Reichner wrote in post #18391638. Spacemunkie wrote in post #18388468
Not convinced by the 5D4 as a video camera at all but I guess it would do if video is secondary.
Spacemunkie, it seems that you and artsf, quoted below, are of very different opinions as to the 5D4's video capabilities. Would you care to elaborate on why you doubt that the 5D4 would be a capable video option for the OP?
artsf wrote in post #18388605
5div is your best bet. Best hybrid cam stills/4k: canon lenses, DPAF, AWB-W, Canon cinematic colors, battery life, superb 4k pircure grab capability (mjpeg). If you do end up with 5div, keep Tokina, it will work great on 5div for 4k video that is only available in 1.8 crop mode.