Some of us have it, and some of us don't. King has 'It'.
I read somewhere recently that the great silent star Douglas Fairbanks had 'it' too. Evidently, when a party was thrown it wasn't really a party until he showed up, and when he left, the party was over. I've read that Chico Marx had it; but he still made whoever he talked to feel as though THEY were the most interesting person in the world. On the other hand, when you were with Harpo Marx there was no doubt HE was the most interesting person in the world.
Here's someone else who had 'it'. Clara Bow. She made the word famous when she made a movie called "It" in the 1920s. She was the first 'It' girl. If you haven't seen it, I recommend.