I am completely biased but I think London is one of the best places to live in the world, everything considered. There's a guy on Instagram who spins a wheel for a random country and goes to eat that cuisine somewhere in London. There are maybe 1 or 2 places in the world you can do that. It's an incredible feat of human diversity to pack hundreds of global cuisines into a 10 mile radius.
As an example, the LA metro Area (LA, OC, SB), 46% latino, 27% white, 15% asian 7% african, 3% mixed
There huge sections of those cities, several kilometers long where you drive for miles and see majority one culture. Several areas majority korean, chinese, japanese, vietnamese, middle eastern, african,