I have a XE90 series TV. I'm quite happy so far with the image quality but a little bit disappointed with some of the supplied apps. Specially DLNA support in the built-in Video app.
I have the latest SW (Android Nougat) and all apps updates.
When I open the "Video" app and navigate my devices (DLNA Video Server), I do not see the actual media. Using different DLNA enabled apps like Kodi or Plex show the correct DLNA content. Restarting the TV does not solve the issue, I have to go to the apps menu, clear all data and "force stop" the app. After that, the newest media is shown.
This is very annoying and unacceptable in such a product. I hope that Sony fixes this bug soon.