The UBP-X700 supports HDR10 and Dolby Vision, although the latter will come via a firmware update, which Sony claims will arrive in Summer 2018. That's quite a while to wait, considering the player launches this month for £270. Here's hoping it's just as good as its Award-winning stablemate, the Sony UBP-X800.
The STR-DH790 is a 7.2 channel AV receiver with support for 4K and HDR plus DTS:X and Dolby Atmos (in a 5.1.2 configuration). It uses Sony's own Advanced D.C.A.C (Digital Cinema Auto Calibration) system to carry out the set-up process for your speaker system.
The amp is due to launch in Spring, but pricing is still TBC.