Many movies have been adapted from Books and stories - What movie do you think best held to the original writers ideas?

Adapted from the writings of Isaac Asimov

Consider All 3 movies. From the writings of J.R.R. Tolkien

Based on "Do Androids Dream of Electric Sheep? by Philip K. Dick

Another Philip K. Dick novel.

Again, consider all 7 movies on this one. From the works of J. K. Rowling

Based on the book by the same name written by Orson Scott Card.

based on the novel by L. Frank Baum.

Adapted from: The Bicentennial Man by Isaac Asimov (Short Story) The Positronic Man by Isaac Asimov & Robert Silverberg(Novel)

Books written by Suzanne Collins

Based on the 1963 French novel La Planète des singes by Pierre Boulle.

I believe for this one we should only consider the 1st movie.

by Richard Matheson from his novel The Shrinking Man