When I lived in France, I had a buddy doing his PhD in French history. He was from Hong Kong. The difference between him and a Chinese mainlander is at species level. The people who grew up in the large mainland cities are educated, writing code for the phones discussed in this thread, and architecting skyscrapers - they speak multiple languages and wear suits. The ex-farmers in those cities poop in the middle of the street, out in the open. others then pump that poop out of the sewers, boil it, and use the floating oil on top to cook with and sell to restaurant.

I would agree that Europe is more diverse that China. Eastern Europe + Russia is not more diverse than China. Neither is Western Europe + Iceland. And China is 10 times more diverse than the states.

source: Russian born, US raised. Also lived in Spain, France, Japan. Been to Every EU and European country, and ~80 countries total. Wife is Chinese, not from the mainland.