Just bought it a few days ago. I have messed with the settings a bunch but nothing fixes this. It's particularly noticeable in the first few seconds of the clip in the background near Dicaprio's head.
The picture on the TV has just never been crisp. Static images look decent but not significantly different than my ten year old non 4K Samsung. In motion images look awful.
Edit: Weirdly, I just changed it to store mode out of curiosity and it looks perfect. Beautiful moving images with zero blur or pixelation. So what is going on?
I'm an idiot. It's not the TV. It's Netflix. It must be streaming in very low quality because the picture on every other app looks wayyy better. True 4K content in YouTube looks awesome.