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The Night shot from the official samples shows triangular point sources for street lights and they aren't greatly corrected for coma in my view and, to be honest, my DA*55 seems as good or better. There's also a lot of blue halos around most of the lights in the scene.

The portraits are also not that sharp at f/2 when viewed at 100%. I'd prefer to try one on my D800e rather than take anyone's word that this is a great lens.

Hence the bargain price of this version  .

 

This lens is sharp wide open, across the frame.  To get similar control of aberrations and falloff you'd have to stop down a regular lens quite a bit.  At that point you lose the aperture advantage.  It's worth the money for those that need it, even if it's a paltry F/1.4 .

The MTF graph shows great astigmatism control and great contrast (red) but resolution (green) is not all that great but is corrected well for astigmatism.

Nikon D800E & 70-200 F2.8 VRII

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Here are some abstract shots I took today using my D800E and Sigma 150mm OS Macro. The pictures were of a few drops of water on a DVD in bright sunlight.