Sony Xperia Z3 Compact has a 4.6″ IPS LCD display with a 720p resolution. It is powered by a 2.5Ghz quad-core Qualcomm Snapdragon 801 processor, 2GB of RAM, 16GB internal storage and a 2600mAh battery. It features a 20.7MP 1/2.3″ imaging sensor, with a Sony G 25mm lens and maximum ISO of 12800 for low light conditions.
CM 12 custom ROM is available for a number of devices now. Instead of waiting for the official Android Lollipop update, you can install CM 12 ROM and get the latest version of Android. A detailed tutorial to install CM 12 ROM on the Xperia Z3 Compact is given below.