"The 'best version' of Deus Ex: Human Revolution features improved graphics" Yeah, no it doesn't
It's an old point but i'd like this to be a definitive conclusion that it infact features DOWNGRADED graphics.
(Minus known texture issues and other crap like the color filter)
The Director's cut uses much lower precision/resolution Depth of Field and HDR Effects. So much so that there are crazy amounts of undersampling artifacts in both effects.
Comparisons of 4 different scenarios (Both in DX9 at max settings minus AA)http://screenshotcomparison.com/comparison/65870
In the first shot look at the glow around the celing lights. It looks natural and smooth in the original. In the Director's cut it's precision has been cut back significantly starving it of the samples it needs for a HQ and accurate effect. You can see visible blurred stair steps that represent the undersampling going on.
The same is true of shot #4 showing the Depth of Field. In motion these effects flicker back and forth constantly resulting in very ugly effects. Something not present in the original game.