Early reports claimed that the Xperia 5 II would be a proper compact flagship; the first of such since Sony killed off the Xperia XZ Compact line a few years ago. Those reports look to have been false now, though, and that's unlikely to gladden the hearts of lovers of small-sized phones.
https://www.notebookcheck.net/Revealed-Xperia-5-II-details-dashes-expectant-fans-hopes-for-a-compact-flagship.490233.0.html