I dunno, I didn't flash stock ROM but slightly modified ROM with Note 3 apps and apart from 1 small bug (there is no Samsung account) I am very satisfied with it. As a matter of fact, not only do all Note 3 apps work fine, but the ROM is stable and noticably faster than 4.1.2. I might yet update to MK9/MKD or ML3, but I'd need the Note 3 pack to work, so I'll hold for the time being. I really like the 4.3 update. On all my devices I've never experienced better update then this one.
Yes, KNOX is a nightmare, so I suggest we all skip it for the time being and use pre-rooted de-Knoxed stock ROMs (MK9 available and MKD is there too but has to be rooted manualy)... just use MJ5 bootloader and all is good!