Interstingly it is the same in german, you would say "Er ist Arzt" not "Er ist ein Arzt". Which makes me wonder why english uses an indefinite article there, since it doesn't seem to be either germanic or romantic in origin.
This was the root of the overblown Kennedy gaffe where he said “ich bin ein Berliner” instead of “ich bin berliner.”
This was the root of the overblown Kennedy gaffe where he said “ich bin ein Berliner” instead of “ich bin berliner.”