The best CS at Hollywood Studios? This is like asking is there a Santa Claus, or a Leprechan, or even a Unicorn; there is no such thing, only in fantasy are they real.
The only place I could come close to recommending would be Starring Rolls. They do offer a couple of cold cut sandwiches, but they are just that, cold pre-made lunch meat on focaccia bread with a slice of cheese and some lettuce. You also get a small bag of chips or fresh fruit. It's ok, but for $11 once you add in the beverage I have better use of my money or a better use of my cs credit on the dining plan.
As for no way I will not go, unlike a few positive posts, it would have to be ABC Commissary. I made the horrendous mistake of ordering the Cuban Sandwich (now removed from the menu). It took me one bite and less than a few seconds to promply reach for my napkin and grossly remove the unedible object from my mouth. And can you believe a year later I once again tried this place and experienced a rather very average (being kind) Chicken Curry. Never again will I try ABC Commissary. Some say third times a charm; I say three strikes your out. Not willing to take that chance again at ABC.