The new Graphics engine has a proper shadow-casting system. Even if it is technically "lower," those shadows make everything look far better than they do in the current engine.

Seriously, people don't even realize just how important proper shadows are to video games. They help cover up flaws while also making the good stuff "pop" more.

This new graphical approach is nothing short of brilliance. It's why it looks better despite being technically weaker in graphics power.