You have to be out of your mind making a comment such as this. You think that the stop-frame, claymation T-rex fight from the original King Kong is realistic???? Yeah, okay. And the films of Buster Keaton are noteworthy because of their ample demonstration of the laws of probability. You really are a rube, Loran. For your next trick, are you going to tell us about how Bugs Bunny is a tool of communist Jews?
You seem not to understand basic differences about genres, Loran. Why on earth you would think King Kong is even remotely classifiable as SciFi is anybody's guess.
All of this individual's flaming insults and put downs aside, I just couldn't resist responding to a few things here. King Kong was not "claymation". He, as well as the other creatures in that and all future films of a similar kind, were created from machined ball and socket jointed stainless steel armatures, surrounded with cotton or other filler, covered with liquid latex (usually in a mold, but Harryhausen invented a technique in which the latex could be applied directly to the armature, not yet casted), and then painted or otherwise finished (Kong was covered in rabbit fur).
Now, while the early stop motion work in the original Kong T. Rex fight is not realistic in the sense of smooth, naturalistic motion, its far more realistic in the sense of the much more conservative physics and mechanics involved. As far as the original T. Rex fight, there was little in that fight that wouldn't at least be plausible to the imagination given the size and mass of each. The new Kong T. Rex scene, on the other hand, especially the continuous falling fight down the canyon through the vines, is reminiscent much more of a Bugs Bunny cartoon or a big budget Hong Kong Wu Xia fantasy film, and in that particular genre and with the particular history and mystique of that film, was ludicrous, in my estimation.
I classify Kong as a science fiction adventure fusion, combining elements of the popular pulp science fiction adventure literature of the times (such as Burroughs's novels) with high adventure and an implied science fiction background (the only real difference between Kong and
The Lost World is that there are no scientists in Kong; no Professor Challenger and no mention of scientific motives)
There are no particularly definable fantasy elements in Kong. Giant Gorilla's and Dinosaurs on lost islands are far closer to our understanding of what the world
could be like than dragons, wizards, and elves casting spells.