I don't think anyone here can fairly say because nobody has K2s yet. I'd wait until people start getting their K2s and the honeymoon stage wears off... then the people who have one of each can give you a more balanced opinion.
Personally, I've been waiting since December, so I thought I was getting a K1 but got upgraded to a K2 automatically. At first I was bummed that I didn't get a choice to stick with the K1, but honestly I think the main reason I was upset was because I'd already ordered a K1 skin, lol. But now I'm so excited that I'm getting a K2 instead. I haven't used either, but I like the look of the K2 a lot better, the screen seems sharper and the text-to-speech thing is too cool.