I had the Xperia Z3 some years back. Great phone, only that it was not a good build. I had (physical) issues with the power button and after I took it to get it fixed I went there eight times because they would not stick the back properly, then the display, then they fucked around with the volume buttons and so on.
And that’s when I found out there’s no Sony support for my country, even though I’m in EU. They don’t sell their phones officially here, they are being brought by sellers from different parts of the world. So, until there’s an official way to get a device serviced I will not buy one again from them.