How many have advance degrees?
Canon law is the many.
CL is the drug of academic selection for clergy, especially diocesan.
Unless one comes with a non CL degree, fat chance a cleric can study for something other than what church decides.
Clerics supposedly are only allowed one day a week off (though not a lot of accountability of what they do with their time when not off). 
Difficult for one to pursue an advance degree other than CL.
Religious orders cut a bit more slack and allow some to obtain a real degree but they are not many, not legion.
I got an advance degree other than CL but at great difficulty and rarely because of a benign bishop.
I share this not because it will make a difference a'tall with thee.
It is primarily for others here who are not in a Procrustean Bed.