David Mazzucchelli started out as a superhero artist, then switched to creating more personal comics in a sketchier, less detailed style, and he now teaches comic book storytelling at the School of Visual Arts.
In 1986, Mazzucchelli provided art for the superhero comic Daredevil: Born Again, written by Frank Miller at the top of his game. Some of the things that stand out to me are the excellent "acting abilities" of the characters, and how they are drawn in a realistic style, but with occasional forays into expressionism to enhance the emotions in the scene. Another collaboration produced Batman: Year One, with similar, though less detailed, art.
A more recent, notable work from Mazzucchelli is the cartoonier Asterios Polyp from 2009, which takes the expressionism further and largely feels like an experiment with the formal properties of the comics medium.
Two people who have drawn in a style similar to the one Mazzucchelli used in Batman: Year One are John Paul Leon and David Aja. There are also similarities to the art of Alex Toth.