It's a little less expensive, but I wouldn't call it "far" less expensive unless you're prepared to stick to the lowest-cost ingredients like rice and beans.
So I'd be looking at about 4x the cost if I ate a delivery pizza every day.
How do the figures compare in your area? Is delivery food radically cheaper?
A couple of footnotes: 1. Pizza is absurdly cheap, even for takeout food. I don't really understand how that works. 2. I prefer takeout over paying for delivery, which saves a lot. My favorite pizza places are in walking distance.