BioShock Infinite
BioShock is fantastically playable and looks great on the PC. We benchmark a 45-second section near the start with all available eye-candy turned on.
GTX 980 and R9 390X are tied in BioShock Infinite, as well. There's plenty of horsepower for gaming at 2,560x1,440 with all the eye candy turned on... but we could say the same thing about the vastly cheaper R9 290.