We binge watched the end of the f ** king world on a sony XE9003, which is a very good series. I dont know if it was in HDR. I would say picture wise it is just on par with blurays. We also saw a few episodes of stranger things 2 on this TV. Again the sharpness was on par with 1080p blurays but the HDR is really nice which sets it apart from it.
Are there any reference quality HDR/4K movies/series on netflix?
I have a LG B7 OLED - Netflix looks quite good. There are a number of HDR shows on it, and honestly, a good 4K HDR stream looks better for the most part than a regular 1080p blu-ray. Some shows blow the HDR though. Overall though streaming quality via the TV's player and the Apple TV 4K are good, however calibration and understanding PQ settings helps quite a bit. I saw that the Apple TV had whacky defaults for HDR (it tries to play non-HDR content on a HDR mode with some tone mapping, and that looks horrible). Amazon UHD / 4K stuff looks just as good. Reference quality for the content I have access to is still a 4K UHD Blu-ray.
"Berlin. Forty years from today. A roiling city of immigrants, where East crashes against West in a science-fiction Casablanca. Leo Beiler (Skarsgard), a mute bartender has one reason and one reason only for living here, and she's disappeared. But when Leo's search takes him deeper into the city's underbelly, an odd pair of American surgeons (led by Rudd) seem to be the only recurring clue, and Leo can't tell if they can help, or who he should fear most."