Sony Mobile 的官方聲明出來了：
The Xperia Z line has reached its culmination – Xperia X series represents a
new chapter and evolution of our product strategy. While the Xperia Z series
was all about bringing the best of Sony’s advanced technologies to
smartphones, Xperia X series is based on bringing smart, adaptive Sony user
experiences across camera, battery performance and hardware / software design.
中文翻譯：
Xperia Z 產品線已經到達了頂點－Xperia X 系列標誌著全新篇章的開始，與我們產品策
略的進化。過去 Xperia Z 系列強調的主軸是將 Sony 最好的技術融入智慧型手機中，而
Xperia X 系列則強調在相機、電池效能與軟硬體設計三個面向上提供聰明、適性的
Sony 體驗。