All great...Sam Langford is a bit shady to compare because its a completely different era of boxing...still a great achievement. None of the others have fought in as many divisions...and even guys like Duran, didnt become champ until 135 so the 120lb wieght class was merely a starting weight class to get exp in. Pac proved that he was world champion material when he won lineal champ at 112 so it wasnt just a case of the kid getting into boxing at an early age...he was a freaking world champ.
He didn't do **** at cruiserweight, though. Hearns last great win was Virgil Hill at 175. Duran at least was competitive until he was in the middleweight division and beat Barkley. Langford beat Bill Tate in the heavyweight division. Pacquiao beat shot De la Hoya in a welterweight fight. Hearns doesn't have a good win at cruiserweight.
Guillermo Jones hasn't jumped as many weight classes, but he's increased his weight significantly more than Pac in winning his titles. Won regional titles at 147, twice fought for the world title at 154, now owns a title at 200 and has fought a couple bouts at heavyweight.
Pacquiao hasn't done **** at welterweight. He beat a shot De La Hoya, and he's being a ***** now with the bull**** 145 limit.