I highly recommend Kings Land on Alameda near Federal. Until I tried Kings Land, the Empress was my favorite with the place in the Far East Center an also-ran. One thing that makes Kings Land a bit different from some dim sum places (such as those in the SF Bay Area - I grew up eating at places like Asia Garden in San Francisco and Jade Villa in Oakland) is that the carts carrying savory dishes hit you all at once at the start and you have a bit of a respite for a while. The range is comparable to what you'd find in the Bay Area: duck/chicken feet, garlic spare ribs, sticky rice with sausage and salt egg wrapped in a banana leaf, thousand year old egg congee, steamed and baked pork buns, har gow, turnip cake, etc. Their dinners are quite good as well - steamed Pacific oysters with black bean sauce and a bargain hot pot where you cook meat and seafood at your table for $15 a person.
