The most significant sci-fi movie of the year was definitely dystopian but didn't feel much like other films in the genre, and that's Stanley Kubrick's A Clockwork Orange.
Kubrick is considered by many to be the best director of all-time, making classics such as 2001: A Space Odyssey, Full Metal Jacket, and Dr. Strangelove.
This was an adaptation of a well-received novel by English author Anthony Burgess written in 1962. The book is excellent and Kubrick's movie is pretty faithful to it, especially compared to some of his other literary translations, such as The Shining, which Stephen King, the author of the source material, wasn't a fan of.
A Clockwork Orange has been discussed to death so I won't spend too much time gushing over it but suffice to say, it's an absolute masterclass in cinematography, editing, and acting.
It qualifies as science fiction in my mind as it's set in the future, but it forgoes most of the tropes most commonly associated with SF such as aliens or time travel.
It doesn't show or focus much on advanced technology and someone is even shown using a typewriter. There are some tiny futuristic cassette tapes, but they're not fundamentally different from what was available at the time.
However, society is definitely different from the 1970s, especially in terms of fashion, interior design and the slang argot called Nadsat created specifically for the book and utilized heavily in the film.