I don't know Cucina, but you should note that Picco is in Marin County (Larkspur) and Pizzaiolo is in Oakland. The other three are in SF proper. I have already given you my rankings on theother thread you posted about pizza, here. http://www.chowhound.com/topics/503074
Great restaurant although I have never had their pizza. You gotta try their Zucchini Carpaccio (with pecorino, lemon oil and almonds). Yummy! The owner, Jack Krietzman also does a great job with the wine.