Digital Foundry’s subscription service for high quality 4K videos has just uploaded a FREE video for Horizon: Zero Dawn. These are high quality files that you have to download to watch.
Either by copying it to a USB and connect to a 4K TV. Or by watching on a PC with a 4K monitor. If not you could watch the embedded video. But be warned it is compressed by YouTube and not showing how good it really does look.
[Source: digitalfoundry.net ]