While the original Cantonese version is widely available, the English dub is primarily found on physical media and specific digital stores.
Interestingly, the English dub slightly alters the character arc of "Sing." In the original, he wants to be a ruthless Axe Gang member to escape poverty. In the English dub, his motivation is simplified to: "I want to be a bad guy because being good is for losers." This simplification actually serves the fairy-tale structure of the film. It turns his redemption into a universal story about the conflict between ego and inner goodness. Kung Fu Hustle In English Dub
"I was saving to become a doctor or lawyer... but this was a chance for world peace." Where to Find It While the original Cantonese version is widely available,