No offense, but I think comparing Harry Potter with Up is like comparing apples and oranges. Anyway, lets look at the box office numbers from the first five Harry Potter movies and compare them to Disney's top five grossing movies from over the same period (courtesy of IMDB).
Harry Potter and the Sorceror’s Stone (2001): $968,657,891
Harry Potter and the Chamber of Secrets (2002): $866,300,000
Harry Potter and the Prisoner of Azkaban (2004): $789,458,727
Harry Potter and the Goblet of Fire (2005): $892,194,397
Harry Potter and the Order of the Phoenix (2007): $937,000,866
Total (2001-2007): $4,453,611,881
Top Grossing Disney Movies by Year:
2001: Monsters Inc., $528,900,000
2002: Lilo and Stitch, $262,700,000
2003: Finding Nemo, $865,000,000, Pirates of the Caribbean: Curse of the Black Pearl, $653,200,000
2004: The Incredibles, $624,037,578
2005: Chronicles of Narnia: The Lion, The Witch, and The Wardrobe, $738,809,845
2006: Pirates of the Caribbean: Dead Man’s Chest, $1,060,332,628
2007: Pirates of the Caribbean: At World’s End, $958,404,152, Ratatouille, $615,935,493
Top Five Total (2001-2007): 4,275,746,625
It looks to me as though the numbers are fairly comparable.