You can't compare engines because of year released. Graphic engines are a work of art and science, and lots of complex maths. It amazes me how people feel free to imply this dev or others aren't good at this or that.
I'm sure devs also want a crisp image with smooth edges.
Even dx9 with hdr makes aa more difficult, and i remember dx10 gave lots of trouble too, since some edges didn't get antialiased in some engines ( remember assassin's creed dx10.1 far better aa vs dx10 )
Supersampling this engines that uses hdr, ssao and huge amount of video ram, doesn't seem viable to me, every feature by itself eats memory, and more important, lots of bandwidth.
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