In my view, no, it isn't.ElRazur said:..... but, is education a yardstick for measuring intelligence?
A good education is a sign of a good education, but is not necessarily indicative of intelligence outside of broad parameters. But it does depend, clearly, on how you define intelligence.
I regard intelligence as being of quick mind, fast to see problems and, preferably, solutions or at least courses of action, as someone that can read situations and people, as someone that sees what others may see but a lot more quickly, or sees things others miss, as someone that can integrate abstract ideas into a coherent and cohesive picture, can see relationships between apparently disparate facts, and so on. I carefully said I "regard" intelligence as being the above, because it's a viewpoint on it, not a definition.
A good education, even a good degree, suggests an ability to do well in a specific academic field, and possibly quite a narrow one, but it might say more about effort, dedication, hard work and diligence than it does about inate intelligence. Also, you can educate someone into having an education, but I'm inclined to think it's far harder, if possible at all, to train someone into a higher intelligence.
So, personally, I regard education and intelligence as very different. Also, it is perfectly possible to be highly intelligent, have a highly successful career and still have little or no education, and perhaps little or no chance of having been successful at one. For instance, Richard Branson's dyslexia put a severe crimp on his educational progress, but I defy anyone to seriously suggest that he hasn't had a successful career, or that he isn't intelligent .... and to do it with a straight face.

Nor, for that matter, does academic success necessarily imply a successful career.