I own both the K3 (that I just picked up today for 89 bucks) and the KT. I have looked extensively at both screens, and I find the K3 more pleasing to the eye, the background is just a shade brighter/warmer. Again, it is such a tiny difference that it is splitting hairs - both are nice screens. If I had to pick one though, I would go with the K3 as the slightly better screen.
Here's a picture I took just now.. which doesn't really show much difference, but YMMV: