When comparing the H8G to its previous model, the Hisense H8F, it become clear that not much has changed. With 75 inch there is now one size more available, but sound quality and viewing angle stayed almost the same. The Response Time was a lot longer with the H8F but the contrast was a little bit stronger. Therefore the X8H is a good successor model.
As well as the Hisense H8G, the Samsung Q80T has a VA-Panel and Full-Array Local Dimming. But despite this the viewing angle is much wider because Samsung’s Ultra-viewing angle layer is used here to improve it. But the layer lowers the contrast of the Q80T compared to the H8G. Nevertheless the Samsung model is better for gaming: It comes with a refresh rate of 120 Hz, VRR via FreeSync, an HDMI 2.1 input as well as an Auto Low Latency Mode which provides a much faster and smooth gaming experience, whether alone or in a group. Also the Q80T has a shorter response time.
In contrast to the Hisense H8G the LG Nano85 has an IPS-Panel as well as Edge Local Dimming and therefore reversed characteristics: The viewing angle is much bigger while contrast ratio and black level are worse. With a refresh rate of 120 Hz and a HDMI 2.1 input the Nano 85 is more suitable for gaming than the H8G. Because of its HDMI eArc Input it makes Dolby Atmos possible as well. It also offers Black Frame Insertion but is flickering much stronger than the Hisense model. All in all it is suitable for games or films in a group.