Actually
Iron Man 266,762,121 foreign box office
Ant Man 339,109,802 foreign box office
Thor 268,295,994 foreign box office
Doctor Strange 445,076,475 foreign box office
Spider-Man Homecoming 545,965,784 foreign box office
The Amazing Spider-Man 495,900,000 foreign box office
Batman v Superman: Dawn of Justice: 543,274,725 foreign box office
Guardians of the Galaxy: 440,152,029 foreign box office
Captain America: The First Avenger 193,915,269 foreign box office
Black Panther is going to have a higher foreign box office than all of these movies.
And these are comparable movies.