How? If there's one thing that fans agree on, is that DmC is beautiful.
I am a firm believe in art direction and creative aesthetic being a real winner when it comes to visuals. It's why I'd say something like Journey looks better than most games. DMC 4, while not looking bad, is hardly much of a standout either. Everything kinda looks exactly the same like someone came over and brushed over every screen with a glossy finish that really just kills any other attention to detail. It's all too clean, and rather bland looking.
The latest Devil May Cry on the other hand had the best level design in the series to date with so many different bright, contrasting colors, a weird demonic shapeshifting world, and a bunch of unique design choices. It really gives the world more of a personality when there's this attention to detail given to all these different areas.
The world just looks more alive, even in the background. Compared to 4 where it's all practically 2 dimensional. Similar textures, similar architecture and buildings, etc. We already know how lazy the DMC 4 developers are. They took all these samey designed areas and just copied it for the rest of the game half way through. The artistry is severely lacking.