It's Homer time. Lefty Carlton. I only can speak for players that I have seen. I'm not a firm beleiver in judging a player by stats alone. IMO, that is shallow thinking. If you wanna go on stats alone, Calton is amongst the best ever.
My favortie stat for him is that he won 24 games for the Phillies one year and the Phillies as a team only won 60 or so. Pretty astounding. He also possessed the most strikeouts in league history for a left hander.