Stewart is definitely one of the most versatile cartoonists out there. His stuff on Batman & Robin was totally inspired by Quitely's style and then he can turn around and draw Apocalypstix which is Jamie Hewlett deluxe, Seaguy, etc, dude can just do anything.
Seeing his stuff in person about six or seven years ago was a real highlight. He had Apocalypstix originals and you could just see the fire on the page.
I absolutely adore Stewart's style. Perfect art for me.