I've seen King a few times (Bull's Head in Barnes, Barbican with a big band assembled by Guy Barker - can't remember if he also played as a guest with Wynton and the Lincolnians - and last year he opened for Roy Haynes at QEH, at the London Jazz Festival). He never disappoints, although I have the impression that he has respiratory problems.
Last year he published his autobiography to great acclaim for the story he tells and his honesty (haven't read it myself).
Not to be mistaken with Peter King, Ronnie Scott's co-founder. Incidentally, this Peter King did play on Ronnie's first night, age 19.
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