I love threads that actually highlight the good artists. I'm dissappointed with the fact that nobody brought up consistency. While Opena's work is great, Reis has been doing his thing almost non-stop since 2004! His work in Action Comics 814 - 825(looks incredible) goes straight to Rann/Thanagar War, to Green Lantern, to Blacest Night, then Brightest Day, over on to Aquaman and now JL. Plus a whole lot of other stuff in betwwen with barely any gaps.
My favorites artists who I consider to be among the top tier: Ben Oliver, Clay Mann, Clayton Crain, and Oliver Coipel. I'll follow these guys to any book(even AVX) but more often than not they put out a few comics and won't be seen till the next year. Reis does double the ammount at least every year. In my mind that makes Reis the winner.