I’m having the same problem. Most shows are fine but so far on Netflix The Crown and The Circle are really bad, and Doctor Who on HBO. If I turn off picture clarity completely it’s worse. If I put it on custom with blur reduction at 6 and judder reduction at 5 it’s better but still obvious enough to be distracting. I tried turning both up to 10 but didn’t see a difference from 5 to 10 so I went back down to 5 otherwise you get the soap opera effect everyone hates. It’s worst if the screen pans across a large scene. It stutters every quarter of a second. My 2018 LG OLED didn’t have this problem so I’m pretty upset that I paid so much for this “upgrade”.
Thank goodness I’m not the only one. I only got the TV on Boxing Day and updated the software straight away. Has been doing my head in and thought I’d bought a dud TV. Let’s hope for a fix in the next update!
I think I may have fixed my issue. I realized it was only occurring on my Apple TV, not on other inputs or with the TV’s built in apps. Settings on the Apple TV were sending a 50Hz signal. once I changed it to a 60Hz signal it seems to have fixed it.
In 60fps motion is very good and smooth. On lower fps content (24/30 which most movies are) there are noticible artifacts on fast moving contrasty objects in firmware 1420 when judder reduction in turned on.
This is how it looks on a judder test on my tv: https://youtu.be/qbieXwt-I2w (the test footage is at https://youtu.be/zFQdMXUFZqM)
It's less noticeable on regular content but still pops out here and there and it's quite annoying. Hope Samsung fixes this soon cause otherwise the TV is beautiful.