I have Komple Kontrol 88 mk2 as well, and it's sitting in my closet. Initially I liked its ability to "kontrol" all those NI instruments easily with its onboard screen.
As far as its action, velocity, etc., I wasn't a fan of it.
If I'm just gonna play piano on a digital device, then I prefer to stick with my VPC1, and if I had a DP, would find satisfaction in a decent one... especially since it can quickly spit out onboard sounds.
There was a time I had a Yamaha P-255 DP, and I liked that touch better than the Komplete Kontrol.
Ultimately, MIDI controllers are generally more focused on its overall, comprehensive capabilities, to do exactly that- control things, with DAW's, etc. whereas a DP is theoretically meant to do one thing-- provide the best pianoesque experience, at its respective price point.