The film and the remake are very close to each other, mostly differing in tone of story. I sensed that the naiveté in which the original was approached has served it to huge advantage as compared to Jackson's take. The humanizing of the ape is not really tried but it works all in the head of the viewer - we don't feel too sorry for the beast, but we can sense slightly that something has gone awfully wrong. And I believe that faintness of this feeling is what makes the original so much more compelling than the one on CGIroids.
The pacing of the film is quite interesting, spending a lot of time with the setup and later rushing through capturing and the escape in New York.