As someone who frequently flies into London relatively late at night, it's not easy to get a decent meal at 11pm, Of course, I'm not sure the options for a decent meal in Manhattan at that hour are great either. The number of fast food restaurants open don't really count and London is better if you know where some of the ethnic enclaves are.

NYC is definitely more of a "city that never sleeps" than most but its hours are not the norm for most major world cities.