Released in Japan as the Xperia Z1f the Xperia Z1 Compact now offers high-end specs in a 4.3-inch form factor to the entire world, as it features a quad-core Snapdragon 800 processor and 2 GB of memory, next to an impressive 20.7 MP camera.
http://www.notebookcheck.net/Sony-introduces-the-Xperia-Z1-Compact-Android-smartphone.108638.0.html