I've never had a problem with getting a refill of wine in J class. Normally they try to refill me more than I want. But then i would never drink 2 bottles of wine in the course of a 4 hr flight.
I too tend to get more refills than I want. But re: wine portions, I suspect this is more about norms in the Far East vs. say North America. A normal glass in HK is highly likely to be a stingy glass in North America everywhere including restaurants. So I often experience the opposite - when I get a glass in North America I think "my goodness" at the size.