I just got myself a Sony XBR 43X800E 4K HDR TV, and I put the Sony Nature Camp video along with a bunch of other Sony, LG, and other HEVC HDR videos through it. (It is able to do direct playback off USB drives.)
Colour rendering is vivid, but not oversaturated. Gradients are perfect, with no banding whatsoever. It just works.
It's too bad macOS isn't there yet.
Note that the TV I got is IPS too and isn't particularly well rated for contrast and blacks either. For brightness, the iMac is rated for 500 nits. I don't know the TV's paper spec for brightness, but in actual measurements it hits about 440 nits, so probably in the same ballpark as the iMac and nowhere near true professional HDR levels. However, even with these limitations in this consumer oriented IPS screen, video overall looks excellent.
We can only hope that Mojave eventually brings proper colour rendering in QuickTime both to our wide colour gamut iMacs and MacBook Pros, as well as to the non-WCG MacBooks.
P.S. I tried 4K 30 Hz over HDMI from my MacBook and it worked fine with no significant lag when navigating around the OS and moving Windows around. However, I haven't tried 4K 60 Hz yet since I don't have a dongle that supports that. I'm going to have to find a new dongle. My dongle has USB 3 as well, but unfortunately the USB-C port cannot support both 4K 60 Hz and USB 3. You either have to get a standalone dongle or else one that only has up to USB 2 support if you want 4K 60 Hz. This is not a problem if you have Thunderbolt like on the MacBook Pros, but unfortunately the 12" MacBooks don't have Thunderbolt, and it's unlikely the MacBook line will get Thunderbolt until 2019 at the earliest, or possibly 2020.
Colour rendering is vivid, but not oversaturated. Gradients are perfect, with no banding whatsoever. It just works.
It's too bad macOS isn't there yet.
Note that the TV I got is IPS too and isn't particularly well rated for contrast and blacks either. For brightness, the iMac is rated for 500 nits. I don't know the TV's paper spec for brightness, but in actual measurements it hits about 440 nits, so probably in the same ballpark as the iMac and nowhere near true professional HDR levels. However, even with these limitations in this consumer oriented IPS screen, video overall looks excellent.
We can only hope that Mojave eventually brings proper colour rendering in QuickTime both to our wide colour gamut iMacs and MacBook Pros, as well as to the non-WCG MacBooks.
P.S. I tried 4K 30 Hz over HDMI from my MacBook and it worked fine with no significant lag when navigating around the OS and moving Windows around. However, I haven't tried 4K 60 Hz yet since I don't have a dongle that supports that. I'm going to have to find a new dongle. My dongle has USB 3 as well, but unfortunately the USB-C port cannot support both 4K 60 Hz and USB 3. You either have to get a standalone dongle or else one that only has up to USB 2 support if you want 4K 60 Hz. This is not a problem if you have Thunderbolt like on the MacBook Pros, but unfortunately the 12" MacBooks don't have Thunderbolt, and it's unlikely the MacBook line will get Thunderbolt until 2019 at the earliest, or possibly 2020.
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