Since I have both this and the Masterpiece Collection now, I compared them today and got a surprise.
First, the sizes compared:
The Masterpiece Collection is about half the depth of, 2 cm less wide and slightly taller than the Ultimate Collection.
Then the surprise - the common extras, I thought they were identical, well, they are not!
I will show each extra's differences:
Storyboards - Top row, Ultimate Col. 3 sheets vs Bottom row, Masterpiece Col. 4 sheets
Poster Art Cards - Left, Masterpiece Col. gloss finish vs. Right, Ultimate Col. matte
Letters - Top pic, Masterpiece Col. 3 letters vs. Bottom pic, Ultimate Col. 4 letters (all different)
Booklet - Identical in contents but different cover. Left, Masterpiece Col. vs. Right, Ultimate Col.
Now, extras that are not common:
The two Art Cards for the two extra movies not in the Masterpiece Col.
Production Blueprints and Sketches only in the Masterpiece Col.
The eight Costume Design Cards (which I love) only in the Masterpiece Col.