The vet says he's perfectly healthy in spite of his weight, and that he's more active than a lot of skinny cats.
I've been asked several times if he's a bobcat, and, no, he's a normal cat. We had him tested for that, and he's normal. Iggy is so big that he can't clean himself, so I brush him and even use baby wipes.
On the bathroom scale he weighs 50 pounds. We took him out to the hog scales and he weighed 46 pounds.
He goes through 30 pounds of food every week.