Here you can find Xperia SP Keyboard for JB ROMS. I have tested it on stock and Existenz 2.1.5/3.0.0. It also works on CM 10.2. Please test and provide feedback.
Personally I found Xperia Z1S keyboard to be laggy while opening emoji so I ported Xperia SP keyboard. It is very fast. It also consumes less memory than Z1S keyboard.
Personally I found Xperia Z1S keyboard to be laggy while opening emoji so I ported Xperia SP keyboard. It is very fast. It also consumes less memory than Z1S keyboard.