surely qualifications come as a result of an education, no?
I'm not sure that how qualified you are to do your job, necessarily reveals your level of education.
Does being qualified to drive a JCB, automatically suggest that you were educated to a different level to someone who is only qualified to use a cartridge nail gun ?
By "how educated are you?" I took the OP to mean what level of education did you achieve, eg, Os, As, further education, degrees, PhDs, etc. not how qualified you are to do your job. Certainly I would say that someone's level of education has a tendency to give rather different information about that person, than their professional/trade qualifications.