LA Times paints a downbeat picture of CK in this interview
Here's a bit of a downer profile about Charlie for ya.
“I feel like I’ve changed a lot in the last 10 years,” he said. “I don’t have the same kind of bitterness or ambition. I don’t feel the frustration of not being able to force my stuff to be made.”
[...] I asked him how he looks back on those days. He won an Oscar for “Eternal Sunshine of the Spotless Mind,” one of his four nominations; surely that was a great moment. But no. “It felt like nothing,” he said. “It did nothing.”
[...] For a while, as the conversation advanced beyond the polite ask-and-answer rhythm of most interviews, we talked about how fame and critical regard had surprised him. His nervy, melancholy time in quarantine seemed to hover in his silences. At last he found the words for what he wanted to say about success: “It solves nothing whatsoever.”
It was a bracingly definite answer from such a careful thinker. [It was also] the first time that he’d sounded, to me, like the specific sort of person who discovers that there are no answers and then sets out to look for them alone: a novelist.(Source)
Bonus: in an article the other day, Spike Jonze compared Charlie to Kanye West. In this one, Charlie gets compared to Gwyneth Paltrow.