What do you 'look for/like in a Sci Fi movie?
For me, I enjoy the 'setting, just that Sci Fi 'aesthetic,
Put the 7 Samurai in space, I might still like it, though original is best.
But mostly just the 'aesthetic changed, like the West version of it. Story is 'mostly the same theme.
I suppose a story becomes more Sci Fi mechanically when it deals with some specific aspect of future technology,
Though I wonder, once we 'reach said level of tech or aesthetic in real life, is the story 'still Sci Fi?
But an example of more mechanically Sci Fi, would be 2001: A Space Odyssey or I Robot,
A focus on the technology, AI.
Or the Alien or Predator movies, what will aliens be like and our interactions?
Though maybe more esoteric interaction movies with aliens are more Sci Fi than horror.
. . . Still, one can imagine various Sci Fi in fantasy, Homunculus and Golems artificial creations of man,
Or when different cultures in history have violently met each other for the first time, confusions in their technologies such as horses or guns. Differences in values.