This is from a 2010 blog post (which can be read in full here -- http://www.newsfromme.com/2010/09/23/possession-and-repossession
-- at his blog), but here's the relevant portion:
Quote:One time I was at a big Christmas party that DC Comics held for its local freelancers at the Beverly Hills Hotel. A very nice party it was and everyone who might have showed up for it showed up for it. Even Jerry Siegel and Joe Shuster were present and so was Jack Kirby. At one point in the evening, a fellow who'd written a few Superman stories (not very many, as I recall) engaged Mr. Siegel in a loud conversation in which he tried to compare what he'd done with the character with what Jerry and Joe, its creators, had done. He kept saying things like, "My Superman can leap over the moon, whereas your Superman could only leap over tall buildings" or "My Superman has deeper motivations than your Superman." The sheer arrogance of it annoyed those of us who had to overhear it but we said nothing. It took Jack Kirby, who had often found himself in the same position as Jerry, to speak up. He leaned over to the young Superman scribe and said, "You don't have a Superman." Then he pointed to Jerry and said, "He has a Superman!"
Just one of many reasons (outside of his art) to love Jack Kirby.
That whole article is a great read, especially if you ever dream of working in corporate media.