Here is an excellent 5 minute video with Douglas Trumbull (who did 2001: A Space Odyssey Visual FX)
Video: Douglas Trumbull On Fast Frames Per Second
shows examples of 24,60,120 frames per second.
Now I see exactly why James Cameron may go 48 or 60fps. If this ends up the way to go I can see Trek producers going with state of the art shooting for future-proofing.