I have to say, the graphical hit is enormous at 4K@120Hz for X900H, I hope they fix it, or probably it's beyond the X1 processor powers to keep up. Samsung looks taller with slightly more vision up and down and less on the sides compared to CX and X900H, strange thing and not sure why the measurement isn't universal. Samsung performance is pretty bad in blooming considering it's 4x times the local dimming of X900H, and overall image doesn't look good. I was surprised though of how close X900H looks compared to CX.
I might skip X900H and wait for another year if by early 2021 Sony announces X950I* to have HDMI 2.1 full support.