Retail legend Mickey Drexler defines leadership

At a gala on Thursday to celebrate CNBC's 25th anniversary, J. Crew CEO Mickey Drexler and Under Armour CEO Kevin Plank shared their thoughts about leadership and competition.

J. Crew's Mickey Drexler:

"I define leadership as: Emotionally you own your business. You own it with passion. And you either have or you don't have an economic investment. But when you have all three of those, you are the boss from Day One, and you care every single day more than anyone. And you have to build a team, but someone's got to lead, and someone's got to be unpopular at times."

Under Armour's Kevin Plank:

"Let me be clear, we really don't like anyone we compete with, and not in, like, a bad way. And I think people that are outside of it, and they sort of look and go, 'How's it going in sporting goods?' I don't call them and send them Christmas cards."