It's a tradition for my son & I to eat lunch at Tempura Kiku or Matsanoma Lounge (same offerings). He is a 16 yo big eater. He gets a sushi sampler & a tempura dish & is full. I get usually get the veggie tempura & am totally stuffed, to the point where DS has to finish my food if he can fit it. So I would say the potions are quite satisfactory. I have not been at dinner (we go to Teppenyaki for Japanese dinner) so I cannot compare potion sizes between the two.