Crysis 3
Crysis 3 is a beautiful-looking game that continues to tax high-end systems. We've FRAPS'd a 30-second section near the start of the game, with lashing rain, numerous reflections and full DX11 pomp on show.
It's not possible to tell the R9 290 and GTX 780 apart in Crysis 3 when run at the 2,560x1,440-resolution setting.
Here's proof why.