Its not the 120hz that makes the picture like that. Its the smoothing effect that u can choose to turn on or off on your tv. Usually you can choose from high, low or off. Im pretty sure all 120hz tvs are capable at running blu rays at 24fps. My tv is 120hz and I turn the smoothing effect off and Blu rays look awesome. a lot of 120hz tvs do 24fps more accurately because they use 5:5 pulldown as opposed to 3:2 like most 60hz tvs. There is a thread called 120hz vs 60hz.
https://forum.blu-ray.com/showthread...ght=120hz+60hz.