Yesterday I finished porting my sharpen effect with some improved options, I will publish it soon when I get the time. I also ported my simple blur and 'Apply Below' (now renamed Flatten) effect from CC, eventually I will bring them all to C2. Next probably I will be working on Curves and Depixelize.
And Ashley, sharpen can be very useful to make scaled fullscreen look less blurry by improving edge contrast. And you can always use it artistically to reflect some state of the game like damage or an increased awareness for instance.