It carried a lofty price tag of around £545 at launch, as you'd expect from a flagship handset but then the SIM-free Xperia Z2 dropped down to a more reasonable £300, $400 (around AU$580) SIM
And let's face it: even if Sony want to, they probably don't have enough resource to support Z1 (not with their current financial status). Supporting Z1 bring no benefit to Sony. One more thing: if you look at the Z1 Update History on PTCRB, you'll see Sony did a fantastic job supporting this phone up until now.

Sony Mobile’s official changelog on this Android 4.3 14.2.A.0.290 firmware Update for Xperia Z1 and Z Ultra. Project Butter performance & UI optimisation and a smoother graphical experience. Sony’s Smart Social Camera to Xperia Z Ultra launched.

Redneck , 15 Sep 2015 Update my Sony Xperia z1 c6903 android 5.1.1 yesterdat, SONY Xperia Z1 Compact after upgrade to 5.1.1 Build No 14.6.A.0.368 The speaker Loudness has been reduced. Install AOSP Android 11 on Sony Xperia Z1. Connect your device to the PC via USB cable. Make sure USB Debugging is enabled. Then head over to the platform-tools folder, type in CMD in the address bar, and hit Enter. This will launch the Command Prompt.
\n\n \nsony z1 compact android update
To download drivers, firmware updates, BIOS, and software, please select your model in the list below, or type the model name in the search box. Learn more about your lithium-ion battery and how to improve battery life. The art of charging: everything you need to know about phone battery life and sxejvn.
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    • sony z1 compact android update