Been wanting to post this:
I have recently acquired the new iPad 4 and running a 3.5mm interconnect cable its headphone out jack to the UHA6SMKII easily beats the sound of feeding a USB/Coax digital signal into the UHA6SMKII. I certainly don't feel like I am losing anything when compared to using the iBasso DX100 and the iPad 4's content management and battery life is way better - I had my iPad playing music continuously for 3 full days and its battery still shows 69%.
I really don't see the need for a CCK anymore on the new iPad and the fact that they have changed the dock to the lightning dock doesn't really matter anymore.
You never tried the DX100 on 1.1.7 and 1.2.7 ;). Big difference from the earlier firmwares. You wouldn't even know you were listening to the same device if done side by side.