I appreciate your preference, but saying artist working for the big two have the same generic style isn't true. Marvel for the most part have diverse styles it's just DC who until recently, stuck to their DC style(Jim Lee's style). JRJ, Frank Quietly, Essad Ribbick (I mah have butchered the spelling), the artist doing Hawk-Eye (dunno his name ), Tradd Moore are some small set of artists working for the big two and they have diverse art styles and influences. And Jung Gi's style isn't even remotely looks the same as those I've mentioned. His style is more along the lines of manga like Katsuhiro Otomo's and early (pre-DBZ) Akira Toriyama's work.
Actually he made some manga (Japanese comic, for Japanese Publication) a long time a go, as popular as a C-class hero like Saitama lol. He was very underrated back then.
Also most comic art involves thumbnailing, pencilling, then inking. (I skip coloring because his work is mostly in B&W). Even those steps can be divided into smaller sub-steps. He doesn't do all that he just skips to making strokes with brush, no pre-drawing whatsoever. And that is just his inking technique, not to mention his complex composition, full mastery of anatomy and proportion of human, animals, cars, scenery, and just everything that exist in this world. Even most masters only grasp one or two thing, even then some of them would have trouble to draw those straight in ink. If that doesn't amaze you I think you're just lacking the fundamental understanding of art in general.