Quite frankly, that deep-dish pizza is enough to fill me up (probably to the point I feel bloated,) but maybe because the image taken makes the pizza look small.
Depending on what part of America you are in, they do have places where they post the calorie content while you are in the restaurant. It is quite common to see a restaurant around here with calories posted right next to the item.
I'm not a big eater, but if the portion size of the pizza is bigger than the image taken, I would definitely save it for home. Usually in a typical restaurant, I skip the Appetizers and go straight for the Entree (I usually skip the desserts too.)