Which Unreal Engine Game Development Company Is Leading the Real-Time Graphics Race Right Now?

Every month we see new showcases built in UE5.4, and the quality jump is wild. But when it comes to real production work, not every studio can keep up.

Has anyone worked with an Unreal Engine game development company that consistently delivers polished environments, smooth performance, and solid multiplayer builds? Looking for suggestions before starting a hybrid PC-mobile project.