I suppose you can show us 100K draw calls @ 65fps using DX multi thread?
What game could possibly use that many draw calls? You'd overtax the GPU and have so much clutter on the screen you wouldn't even be able to see anything.
It's great that Mantle offers such high performance and reduced overhead, but quoting big numbers is a bit of a spurious argument in my opinion, because the majority of games are not really draw call limited.
DX11 multithreading can probably do a maximum of 20K draw calls on a well designed multithreaded engine like Firaxis's Lore Engine. I have no idea how many draw calls 3D engines like Frostbite 3 and CryEngine 3 as they use immediate context via manual threading.
And PCs also have something called instancing, which allows you to batch draw calls for objects with similar properties. This can be very effective at reducing the amount of draw calls, as the CPU doesn't care about the size, only the amount.
At any rate,
IF we ever have games that issue that many draw calls, by the time they roll around, we'll have DX14 or something which will have a reduced operating overhead similar to Mantle, but not as thin as to retain a reasonable degree of abstraction and backward compatibility.