I didn't realize Chick Fil A was more upscale. Though the one s in my area are food court versions-- are the full physical locations markedly nicer inside than McDonald's? I think their employees do get paid more and/or better benefits though.
I wouldn't say the physical location is materially nicer, but the food experience is. I don't think I've ever been served stale food at Chick Fil A, and at McDonald's there's a very good chance on almost every visit. The employees also seem much happier and more helpful in my anecdotal experience.