I am pretty good with understanding accents. Yesterday, it sounded to me like Meghan Markel had adopted a lot of Canadian in her accent, from filming in Toronto so long.
My son lived in Hong Kong last season. He coaches hockey schools there, as well as in Beijing and Singapore. Plus, he has a close friend he played pro with, who went to coach hockey in Korea, and he became a Korean citizen and played for them in the Olympics this year. My son says he hasn't had to learn any Chinese, because they all speak Englsh well.
As for Quebec - horrible accent. My grandmother immigrated from France. She wouldn't stay in Quebec, the accent was so bad. But, Moncton, New Brunswick, the worst patois, ever! I literally could not understand a single word. I talked to a man who came from France to teach in the French university, and they couldn't understand him, and he couldn't understand them. He ended up teaching the course in English, which they could communicate in.
I've had lots of close Filipino friends. Most of them spoke various dialects, but Englsh was almost a first language with a distinctive accent. Not difficult to understand them at all.