I just updated my mom's stock G2 to 4.4.2 via OTA. I compared it with my G2 4.2.2 stock rooted. here what I tested so far launching apps side by side.
*camera, gallery, knock on, dial pad, playstore, gmail, text massaging app, taking pictures, are all hair faster even pressing the power button wakes the screen faster.
*knock off(turn screen), launching hotspot(new icon),
*swiping down on lock screen for notification is definitely less choppy