I'm not sure Unreal Tournament 4 is a good comparison to anything. It's stupidly fast. It may easily have the most beautiful graphics of any game I've ever played, yet plays effortlessly >60fps at 4k with a R9 390 with ultra settings. Keep in mind, too, how fast the action in this game is.
Games like Battlefield 4 and Tomb Raider on the other hand, play at 60+ fps only with slightly tweaked settings and still have occasional frame drops during moments of high action. They're really not any prettier. The Batman games do well with FPS but still stutter for reasons unknown, but seemingly related to CPU (PhysX? Texture loading?). Point is, UT4 might be in a class of its own.
By the way, one other thing I've noticed is that older games do not necessarily run much faster with beefy hardware. This surprised me. Some such as Doom3 scale well with the newer hardware, whereas games like ROTT 2013 and Serious Sam 3 don't, having worse graphics and performance than newer titles.