“If the source I'm connecting will only output at 60hz frame rate then would the 50" & 55" have similar motion fluidity since the 55 couldn't take advantage of a 120hz signal? Or is there more motion processing options in p55+”
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Yes, motion should be very similar. If you have a 120hz TV - it duplicates each frame of the 60hz content twice. You can turn on motion interpolation on a 120hz TV though - "reduce motion blur" and what that does is creates a brand new frame in-between two actual frames of the 60hz content. That is known to create an unrealistic "soap opera effect" though and typically motion is smooth with 60hz content so motion interpolation is unnecessary and introduces a detrimental effect. A 120hz TV only matters for two things - playing 24hz blu ray content and playing 120hz PC games. When it comes to blu rays - most films are recorded at 24hz. You can typically set your player to output content at 24hz or 60hz - if you have a 60hz TV then the player converts the frames via "3:2 pulldown". One frame is displayed 3 times, the next frame 2 times, the next 3 times and that pattern continues. With a 120hz TV, you can play it so it shows each frame 5 times. This is where 120hz frame rates come from - it is the lowest common denominator of 24hz content (BluRay) and 60hz content (OTA broadcast, streaming players, cable etc) allowing all the frames of any content to be played at a constant rate. 3:2 pulldown can slightly modify the motion of the film. From my experience watching Blu Rays on my 5 year old 60hz LG - you do not see anything wrong or funny with the picture - it's always clear so while 3:2 pulldown looks scary on paper... I don't think it really changes anything.
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