Hmm.
Paul and Harry are consistent with quality and rarely do either make a "bad" post. However, the number of really memorable posts for either is also quite low for me.
Johnny has a lower post quality but has had some exceptionally fine moments. However, since expanding his role on SA, most of these moments have because quite masturbatory.
Speaking of masturbatory, James has one of the highest numbers of awesome posts, but this is often mired in a lot of meh posts.
I still rate Kieffer's attempts at new threads quite highly, but I am rather sure I still remain in the minority for this.