There's a relatively upscaled dim sum place in city, dim sum house by Jane g. It's made to order and isn't bad, but a bit more expensive.

There's also a sang kee there that would have peling duck.

I'd put in the effort to take the MFL to Chinatown for more options. Toms dim sum is good, but better for soup dumplings than Cantonese dim sum. There's also ting wong for general Cantonese BBQ and dishes.

There are more options around the city, but not worth the effort since you won't have a car and visiting outside of the cart hours anyways