Just took my Note 2 off stock, and onto an early CM11 (Kitkat) build yesterday, and wow! 4.4 is quite a nice functional upgrade from the last several, and the full-screen Google Now page integrated into the home screens has to be one of my favorite features.
Using the Plasma Kernel, I've got access to all the features of the Wolfson DAC, and set up correctly, the phone sounds surprisingly good with my JH13's. Playing high-res stuff, it's not quite up to the level of the HM801 and 901, but closer than I ever would have expected from a phone.