This movie is quite as great as that one.
But it is used by this literary giant.
"I only say it is now obvious that it is quite as possible for them to appear in the future as it was for them to appear in the past."
The Collected Works of G.K. Chesterton, Vol. 36: The Illustrated London News - G. K. Chesterton - Google Books
But even if it is odd, the meaning is "This movie is just as amusing as that one?" Exactly? To the very same extent?
Thank you very much.
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I think of "quite" as meaning "fully," but it often used where the expectation is significantly less, so it usually ends up sounding like "moderately" or "fairly" despite its literal meaning.