Oh wow...
Great shots !
One question, are you using some special presets to have these colors and sharpness ?
I can't be sure, maybe a high MSAA ?
My card does let me get away with high Msaa, all the way up to the maximum, though that can bring my frames down from 100+ to somewhere between 60 and 80. Usually I run at 4x
As for colors, nothing special. My card (GTX 770) is at standard settings, except I added about 5 points of digital vibrance to saturate colors a little, which makes everything pop a tiny, tiny bit more.