Definitely not. I am sure Cantonese isn’t that big in China (everything is bigger in China), so I consulted Wiki for a quick look. According to English Wikipedia citing a 2004 study: Mandarin: 798.6 million (66.2%) Min (“Fujianese”): 75 million (6.2%) — incl. Hainan, Hokkien, Teochew Wu (“Jiangnanese”): 73.8 million (6.1%) Jin (“Shanxinese”): 63 million (5.2%) — …