There seems to be something wrong with my phone, the battery life is not even close to what you guys are achieving.
Example from today, no heavy use (had to charge now since not going to be home to charge in the evening but this should give you an idea). ~10 minutes of Clash of Clans (game), ~20 minutes of facebook, ~20 minutes of facebook chat. No surfing, no music, no videos, no picture-taking. Bluetooth, NFC, WiFi all disabled. Brightness is on auto-adjust.
On JB the battery sucked because of the fast dormancy bug. On KK it seems to suck for some other reason.