I can get a screen cap later, but here's my run down.
i5 4670
32GBs DDR3 1866
Asus Radeon R9 290X@1050Mhz and Catalyst 14.11.2 Beta
2560x1440@60Ghz
Using the Ultra presets, with MSAA turned off, my machine scores 38min/50avg under DirectX 11. Under Mantle, that drops to 33/40. I suspect its because my CPU is simply too fast to really take advantage of Mantle, but there's likely some more driver & game improvements that could bring that up. Mantle and BF4 on this same machine saw measurable & consistent gains with Mantle of DX11.
Actual gameplay seems pretty representative of what I score as well, usually in the mid to upper 40s frame rate. For this game, thats a perfectly acceptable frame rate. I think odds are good that I could easily get it to a consistent 60 with some selective tweaks . . . but I'd rather oogle the eye candy. The 30fps cutscenes are still pretty jarring when it transitions to them and back to gameplay.