I think the X800 doesn't support, like many (all?) Sony players, DVD-A? What are the best 4k/HDR/3D/SACD/DVD-A players out there? I think there's a Pioneer that's huge and expensive (although less than a used Oppo UDP 203 haha) but not sure what else is available new nowadays.
VIDEO: Epson 5040UB | Sony 65X900A | Sony 55X900A | Samsung UN40H5500
MEDIA: Oppo UDP 203 | Oppo BDP 103 | Apple TV | Nintendo Switch
RECEIVER: Yamaha Aventage RX-A820
AUDIO: Monitor Audio Silver 100 (front), Monitor Audio Silver C350 (center), Monitor Audio Shadow 25 (rear), Rythmik L22 (sub)