It was also rendered with MSAA which was removed completely in favour of FXAA to get it running on a single GTX 680.
Plus the demo was never that impressive to begin with; the 'volumetric light beam' (I am sure they were aiming for that) from the robot was almost comical.
Keep in mind that it was UE3 with some added effects; an engine that is pretty outdated and un optimised as well.