Does Rol San have carts or just menus?
Rol San is VERY fresh and one shouldn't miss the carts given how excellent and well priced the dishes are. FYI, many restos in HK and China are cartless.
Yes, it is very busy on the weekend. TIP: those in the know try to jump the front line by going directly to the back room 'line'. The seating system is heavily flawed, so you need to be a bit creative to circumvent either line up. As well, the back room is a completely different experience [than the front] as it accomodates large groups and you honestly feel like you are eating in HK...kids running around and all...
Just menus at Rol San.
I find Rol San's dim sum are fresher than most of cart places like Sky Dragon, because the dim sum is steamed or fried to order, instead of being carted around the dining room until someone decides they'd like to eat it.
Haven't been on a Sunday so I'm not sure about their line-up situation.