Would you bet that two intelligent human-beings, scoring the same on IQ tests, will succeed identically in life? 
Whatever the IQ score, it may be the only point of comparison between two persons, especially if one is a solitary analytical kind of person and the other one is a gregarious individual fond of interpersonal contacts.
Since Damasio and brain studies by neuroscientists, the brain has given up many of its secrets and we now know that humans are not only rational mammal endowed with objectivity, logic and creativity but that emotions are closely linked to the cognitive processus.
Many studies have underscored the importance of EQ compared to IQ (Egon Zehnder’ survey on 500 senior Executives, showing that managers with higher emotional intelligence outperform those with a great experience and a high IQ)
Indeed, Managers with high EQ:
• make better and more rapid decisions,
• are held in highest regards by their staff,
• have greater success in his career.
The good news is that EQ is a competence which increases with age and that one can train this skill.
That's why it is so important to know what kind of person "me" is. Because the "me" temperament influences every single action people take, influence their personal and business path, explain the way people get along with others. Because many of our emotions betray us we try to hide, ignore or even change them. One should beware of not listening and acknowledging them, otherwise one’s body will painfully remind us to be sensitive to our emotions…
Once you know yourself well, you can try to understand and identify other people.
One can make the comparison with musical instruments and playing those musical instruments. You wouldn't try to play piano with an electric guitar.
 Damasio, A. Descartes' Error: Emotion, Reason, and the Human Brain. Penguin (Non-Classics), 2005.
 LaHaye, T. Why You Act the Way you Do. Living Books, 1988.