I was playing around with the shaders setting trying to fine tune them for each system (at least the ones that can handle them without sacrificing performance) and I happened to stumble across this:

http://research.microsoft.com/en-us/um/people/kopf/pixelart/supplementary/multi_comparison.html

The pages shows comparisons for shaders, be sure to specifically check the “Ours” link at the end of each list of shaders.

I have to admit their’s looks quite good. Unfortunately I can’t seem to find anything to indicate one can actually obtain this shader, but I figured I would share it none-the-less…