Not a bad phone, violently expensive at launch, but actually not a bad price right now, this phone comes with
Dual Front Facing stereo speakers
5.2 inch Full HD LCD Screen
3GB LPDDR4 RAM
32GB eMMC 5.1
2900mAh Battery (considerably larger than the X Performance)
23MP Camera with both laser autofocus and Phase Detection autofocus, and a colour sensor to get colour accurate photos (this, in theory, should fix the issues Sony have had in the past with cameras in their own phones).
13MP front facing Camera
Dedicated Camera button
side mounted fingerprint sensor (best placement in my opinion)
Supposedly plastic build
"Only" 3GB RAM
Battery is smaller than the Z2 3200mah and Z3 3100mah from a few years ago.
eMMC 5.1 instead of the much superior UFS 2.1 storage type.
FRONT FACING NFC Reader (stupid placement)