Comics would absolutely exist, but they would almost exclusively be enjoyed on the matrix, hardcopies would be collector's items. As comic characters should realistically be remembered in Shadowrun, it makes sense that iconic characters such as Superman would at least be recognized, and more likely still be in "print". In fact, including real world references of products, brands, etc adds a great deal of immersion and realism to your Shadowrun game. For example, what happened to the Ultimate Fighting Championship? In your game, maybe it's still around, and when the players find that out it will surprise them. The UFC still exists in my games and I occasionally mention names of the current champions, such as Michael Bisping's grandson Sam. I threw that in as one of my players had mma as part of his backstory, so the discovery that the UFC is still around sparked his interest. As a little something extra, it is mentioned in Shadowrun fiction that Harlequin wears pins on his jacket of old and sometimes obscure musicians and groups, so I don't see why comics cannot live on in the same way.
