I have seen the effect that Xenon is referring to and I am not sure its the frame rate. It was at a Magnolia and they were playing a dvd or blu-ray of one of the King Kong movies and the seen featured a lot of action with dinosaurs. I have also seen it a few times on demo tv's at Costco. The objects on the screen seemed to have very hard edges, seemingly making the larger ones pop to the forefront and giving the overall movie a cheap 3d effect. This was not something I noticed when I watched the Hobbit in the theater in HFR. My sense is that PeterT is right about the TV's setup being the culprit
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra