I think it's odd that so many people haven't had Chik-Fil-A... I've been eating there my entire life and their headquarters is just a few miles from where I am sitting right now.
I go for a #1 and add a little light mayo and pepper. Sometimes I get the side salad with fat free honey mustard and a small fries though. Yum!
As for the "deluxe" option that add lettuce and tomato to the sandwiches, they have had that for years and years. You can ask for regular mayo or light mayo. They also have a great sauce that comes with the grilled sandwich but you can ask for it otherwise... though it's a little high in fat for me to eat very often.