Hmm, chetbaker doesn't play out of the same books I do.
Anyway, if you've got an F, you've probably got a G. I find them the same. It's the break at Ab/A that separates the men from the boys, IMHO. (Yeah, I'm still a "boy" in that regards).
High school wind ensemble requires Eb and E at the higher levels of achievement.
Gotta go work on that Ab...
Dave