Question: Is the Cantonese dialogue in Ip Man (2008) dubbed, or am I watching a different language?

If you go back to the 80's and before, Shaw Bros and even early Golden Harvest stuff the films were ALL shot silent and dubbed in later, usually with different actors. So like the first Drunken Master movie? That's not Jackie Chan doing the Cantonese dub.

Ip Man, however, would have been long past that time so I would expect if you have a sync problem that's just a not great sound synch between the recorded sound on set and the scenes they along with and not something else.