I have a Z1s on T-Mo USA, so an ever so slightly different configuration for the LTE radios.
With Stamina Mode enabled and set to allow traffic from Exchange Email, I'm averaging 36 hours between charges, running the battery down to under 5% consistently.
On my heaviest day of use so far, I was on the phone for 6 hours via a bluetooth headset while simultaneously running the WiFi Hotspot off the phone, and still got 14 hours out of the battery. My SGH-T989 Hercules could never have dreamed of that level of performance. I'm stupid happy.