Sony Xperia ZL has the same specs as the Xperia Z. It has a 5″ display with a 1080x1920p resolution. It is powered by a 1.5 GHz Quad core Snapdragon S4 processor, 2 GB of RAM, 16 GB of internal storage which can be expanded with a microSD card. It is not water and dust proof like the Xperia Z. Additionally, it uses IR technology to use the phone as a remote control for a television.
Android 4.4.4 KitKat is not officially available for the Xperia ZL but you can still install it, via the CM 11 custom ROM. CM 11 is developed by the CyanogenMod team and it gives great performance and stock Android experience. Follow the guide given below to install it on the Xperia ZL.