Dude the next day im bloated usually after having pizzas. They don't fill me up but they make me gassy the day after and to feel full i need to eat atleast 2 medium size ones. One is okay as a snack. This is same with most of my friends too. I don't know if i live in another world i used to go to Pizza hut and have their unlimited meal option where i ate atleast 2 medium pizzas, one plate of garlic bread and a drink.
I usually eat up one whole regular pizza for dinner comfortably without feeling that eaten too much.
Once I even ate the whole medium cheese crust pizza