Of course, it would not surprise me to learn that measuring IQ as a predictor for success (or at least what a measurer defines as success) is much more accurate than "measuring" EQ for the same purpose. It makes sense - IQ is demonstrably measurable while EQ is some vague concept "popularized by a journalist". However, to go from this to a broad statement that there is no such thing as EQ is just silly. You could just as well say that there's no such thing as beauty because there is no accurate test to quantify it.
For a simple demonstration that EQ is an important quality for prediction of "success", just think of all the successful people you know and ask yourselves whether you think they would be as successful if they had the emotional makeup of an 8 year old.
This Quora answer has too much of a "trust me, I'm an authority" vibe to it
edited: ok, removed stuff that upon reflection does not contribute to the discussion - my apologies for that. The main point however stands. The repeated claims of no such thing as EQ should be qualified with "in the field of psychology" - in that case, I have no objection to the answer.