Vancouver (more precisely Richmond) is really an immigrant city these days. It went from mostly Hong Konger, to mainland Chinese, to other Asian immigrants including South Asians (Indians). It is pretty much the entire Canada maybe exclude Quebec now. They took in a lot of immigrants recently, and US companies have been sending engineers they want to keep who couldn't get H1B extension to Canada as well.
As for the Chinese food quality there. I went there with a friend from Seattle last December: it is not bad but I wouldn't call it out of the world. They are more authentic, and they are affordable, but still made to a price point. No matter where you go in the world you get what you pay for (or you don't get what you don't pay for). If you go to your local high end Chinese restaurant you probably can get same quality or better food by paying more. As for Chinese food in high quality, look for the fish tank up front, or look for the wall decoration that is good enough for wedding banquet, and you will usually find the legit one. Just don't expect Panda Express price for high end stuff.
Vancouver (more precisely Richmond) is really an immigrant city these days.
From Google : Richmond,
British Columbia, incorporated as a city in 1990, population 209,937 (2021
census)
Half the population is Chinese. Altho it can seem more like 90% whenever I had went there to either work or shop.
Vancouver City proper (not including the suburbs) is at 750,000 residents (2025). Nearly 30% is Chinese. We also have a big Vietnamese population. With over 35,000 in the metro region. Possibly another 100,000 Koreans , mostly in the suburbs.
Another 130,000 Filipinos in the Metro.
Another 500,000 South Asians , mainly (East ) Indians. You can really see it in the suburb of Surrey, with a general population over 700,000 and I'd say at least 230,000 South Asians . Really great if you are like me and love Indian restaurants! Also many Indian/Pakistani restaurants in Vancouver.
One large ethnic group worth mentioning here are the Iranians ( from a foodie perspective). At least 200,000 Iranians in metro Vancouver. When I worked in the suburbs of North Van, West Van and Coquitlam, wow, you can really tell a lot of them live and work there. Many Iranian owned businesses all over, especially restaurants. They make some yummy dishes, I tried a few different places, plus their bakeries...they remind me of my own people, Italians, with their love of food.
I give you Panda bear, and others on here who are interested in doing a visit one day, to read off a very favorite food blog I check out every day for the past 13 years or so...Sherman's Food Adventures. The dude goes every day/night to a different eatery and writes up great online reviews with pics, location, etc.
https://www.shermansfoodadventures.com/ (check out his archives/sub categories...years and years worth of food reviews, including some travelling to USA and other parts of Canada)