Well, I guess you are just Lucky, but your luck doesn't help me much. I have a Droid Razr Maxx HD that has been giving me about 48 hours plus of use per charge. I actively use the phone somewhere between two to three hours a day, and when the two days were up, I usually had 10-20% left on battery.
Now that I have 4.42, the battery drains flat in approximately 24 hours. The usage ratio before KK was, roughly, Screen:60%, Android OS:30%. The usage ration after KK:Screen:30%, Android OS:60%. My guess from reading various posts is that there is some app that influences the OS and causes bad battery drain. I have been using a Battery Save mode between 11PM and 6AM, and it doesn't increase battery life at all!
Are you using a Samsung Note 3? Do you still have the same average battery life? Did you note the ratio of Screen and Android OS before update?
I am really enjoying the new stuff in KK, but something that worked fine before is broken. I have two apps that were definitely broken by KK, but that is probably to be expected. They didn't affect battery life, just didn't work correctly.