I actually bought a deli knife to use at home, since I make a lot of sandwiches for the family. I tried using a regular chef's knife, but it just squashed the bread. The smooth edge didn't provide any cutting power, either. I also used what they like to call a bread knife, but it was almost too serrated. I'd have a pile of bread crumbs on the cutting board.
This deli knife goes right through the bread like it wasn't even there. I can cut full sandwiches into finger sandwiches for covered dish dinners or book club meetings. A good deli knife is worth the effort to find it in kitchen supply stores or online.