Sony announced the X series at Mobile World Congress in Barcelona, comprising three new smartphones. The company also confirmed the Z series will end with the Xperia Z5, leaving the new X range to take over.

The Xperia X Performance sits at the top of the X series, although sadly it won’t be making its way across to Europe or the US, stopping its journey in Asia. That’s not to say it isn’t important though, because in actual fact, the X Performance could very easily have been the Xperia Z5’s successor.
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https://www.pocket-lint.com/phones/buyers-guides/sony-mobile/136883-sony-xperia-x-performance-vs-xperia-z5-what-s-the-difference