my opinion so far
1. battery life
mediocre. assumption of Sony greatness in optimizing, light software UI, small screen and FullHD screen to translate for good battery life somehow not materialize. i dont play game, SOT hardly can reach 4 hrs. (sync always ON, location set as battery saving, auto brightness).
2. fingerprint
demn good!
3. smoothness.
impressive when consider it only have 3gb ram. satisfied and smooth. no issue. only minor gripe noticed kinda lag/slow response when using RSbrowser when press new tab.
4. build quality
picture didnt justify it's beauty. it looks ordinary but when holding it, feel great!
nice in hand feel. screen to body ratio can be better though
5. dual speaker
meh. quality not that good. maybe better a bit then others but the loudness really like
soft. at least last time when using Z2, i'm satisfied with the speaker when compared to other flagship at that time. this one like, common. it is Sony, should have great audio also.
6. reception & call quality
good. happy. no issue like any other smartphones i used before
7.UI
light and easy. i like it. much better than S7Edge UI. but bomb7 Grace UI also pleasing to the eyes.
sony music app among the best.
8. video recording
no personal comment. dont bother to record any video even with previous smartphones. from youtube, sony EIS/steadyshot looks awesome.
9. still camera
in good lighting, satisfied. nice!

just need to ensure steady hand but autofocus can be better though and saving picture even @ 8mp, for me i would say damn slow. need to blame UFS storage in boomsung phone.
low light...so so. im not camera guy that like to fiddle with the setting before take picture, for me, when wanna snap, press wanna it to be nice and good. but with XZ, need to put more effort in capturing photo.
in general, a bit disappointing coz after few z series generation, a great mobile camera sensor maker and great camera PNS/DSLR maker still playing catch-up game in camera optimization in mobile phone even with their own sensor
other OEM like HTC, Google, Samseng or even chinese OEMs able to finetune Sony's sensor to produce better image and Apple by using much smaller size sony sensor optimize to produce better image than flagship Sony sensor in Sony phone then something not right in Sony's camp.
10.will i recommend to average joe outside?
nope. some of my friends who are looking to replace their bomb7, asked me about this XZ when saw i used this phone the last 2 days in office, i just told them better just get S7e to replace their bomb7.
when asked why i bought this, i just said, typically i favored either Samsung flagship or Sony flagship, so it's time for sony. after all i had used the last 4 samsung flagships (s6, s6e, s7e, n7)
and i told them,the spec certainly not worth to buy this phone @ 2699 from retail shop. if wanna buy js buy from gemfive, find seller @ 2499 and use discount coupon to make it around 2.28k.
if wanna pay 2.5k, better js get Huawei P9+ or S7e.
the above opinions may sounds negative but yeah that's my personal thought it.
do i regret bought it? nope.
using XZ naked without any case, the feeling itself is priceless.
Agreed, I believe this phone is more to true Sony fans or someone who wants to be unique. I personally find this phone nothing special compared to IP7, Samsung, Pixel, OP, Huawei, and all that, but their design and quality just never fails me. It just makes me want to own the device, just my opinion