I guess it would be divided into to adult cf care and then pediatric care.
As a kid I was fortunate enough to grow up near Philly, Pa and my cf ped doc was Daniel Schidlow@St. Christopher's Hosp. He's an amazing ped cf doc. The rest of the staff is good too-though I haven't been there in 5 years so it could be different now. Schidlow has been voted by Forbes magazine-(I believe its Forbes, maybe Time mag)-several times as the number 1 respiratory ped doctor in the US.
As an adult, I married and moved to the New York area. Sow now I go to Dr. Walker @ St. Vincent's Hospital-(of 9/11 fame) I don't know about her, but the Respiratory PT team has a reputation as being one of the best in the US also. The head of the PT department there is the woman who basically invented the clapping airway clearance method many years ago. So I know from talking to people that they are definately in the top 5 at least in the US. They have a very agressive therepeutic approach to chest pt. Strict, but with amzing results. My doctor is an amazing doctor, and believe me I'm picky. Between stopping my pediatric doc when I got married and now, I went through 2 cf doctors. I won't name names, but holy crap....there are some bad ones. I can tell you with 100% positivity that if I had stayed with this one in particular, I'd probably be dead in a few years.
So, I'd have to rate my cf team at St. Vincent's #1. I've been around to alot of em. And they are amazing peeps!
To sum it up-in one year with them, I started at FEV1 of 48. And they helped me get to 75 and hold it.