Just a little food for discussion!
As much as I like Roger Clemens I'd have to say the most dominant pitcher of his era is Randy Johnson. He is another physical phenom who is still throwing 'em in the upper 90's. He's done something that only one other pitcher in history has done and that's win 4 Cy Youngs in a row. He also won pitching's equivalent of the triple crown with wins, ERA and strikeouts. Incredible for a guy who is approaching 40. He is a fierce competitor who doesn't give in and hates to lose. He will go down as the greatest lefty of all time.
Like Roger, he will be a first ballot HOF'er. Congratulations Randy.
P.S. Roger is still better looking though.