>>2816751 (OP)
If price of food doesn’t matter then some big American city like LA or NY will have the best Chinese, French, etc food. Such list of expensive cities would be very boring though.
Then if price/authenticity is taken into consideration every city from this list should be gone. People from Seoul fly to villages in Vietnam to eat. Hai Phong has better seafood than San Sebastian for 1/10 the price sold on every road every 50 meters. Also if you go to San Sebastian in 21st century it has the same culture as LA or Berlin or any other western city. So if you come from a western city you’ll not see anything new. Hai Phong is very different from Berlin, Seul, Guangdong, even from Hanoi.