So the TV going completely dark on a black screen, not just black, but
dark, is friggen nuts. My last 4K TV had amazing picture but it was an IPS panel, so black screens had the glow of the back lighting resulting in a mild grey with a halo of luminosity. The bars on wider aspect movies are indiscernable in the dark. The picture itself is also mindblowingly better in literally every aspect - clarity, color, saturation, luminosity, depth is almost 3D like from a flat panel. The nearly edge to edge of the screen (like 2mm edge). The picture is also perfect when viewing from almost perpendicular.
I had some concerns over the frailty and thinness of the screen, being about 3mm thick across most of the screen, handling and mounting it required some finesse and delicate touch. But got it up and running without issue. Only real setting I had to adjust was turning on HDR for the HDMI port.
Good call on the C8.
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