I'd say it's a mixed bag. You have a good number of very entitled people, particularly among legacy admissions and undergrads that go there primarily for their career.

But yes, people who go their primarily to study (often grad students or international students) can be very down to earth.

Frankly, I'd expect more narcissistic or mentally unstable people in high-IQ clubs (though two fellow students at university were at some point placed in the closed psychiatric ward).