CyanogenMod supports a few new devices today, all of them Sony. Just head over to the CM download section and you can get nightly builds for the Xperia Z3, Z3 Compact, and Z3 Tablet Compact with LTE (that's Scorpion). This follows the WiFi version of this tablet getting support just a few days ago.

2015-01-21 11_09_11-CyanogenMod Downloads

These are all CM12 builds, which means you'll get some sweet Lollipop action if you install them. To do so you'll need an unlocked bootloader. Many Sony phones support bootloader unlocking through the dev program, but that will affect camera performance on some devices. Fair warning.

Being a nightly, there are bound to be bugs. Just know what you're getting into and keep things backed up.

[Xperia Z3, Xperia Z3C, Xperia Z3 Tablet Compact]