What i think of the XA ultra so far...comparing with my Z3+
The good:
Big and bright beautiful edge to edge display, it may just be 1080p but it has very good black level and neutral colour though a little on the cold side....the display can be soo bright that it is completely legible even under direct sunlight.
Phone performed quite smoothly despite using a mediatek CPU
The front camera was very good, it has both OIS and LED flash. The colour reproduction and sharpness was so good you can literally see your skin pores/pimples so becareful...
Back camera was well, with good colour and exposure thought i feel it isn't sharp.
The speaker was plenty loud, so loud that the people in my surrounding and myself was often shocked by it.
The phone was surprisingly cool, no sign of heating up most of the time even when charging...the only time it became hot was when I was in the hot sun playing Pokemon Go for more than 30 min
The bad:
Battery life was average, similar to any other smart phone out there...
Pretty bare-bone OS, many Sony features are not included, like PS4 remote play, dualshock 4 support, Smart connect...etc are not included.
GPU performance may not be good, many games may flag it as low end and refuse to let you choose higher graphic settings/ or simply refuse to run.
Loud speaker despite very loud, sounds sharp and tin. Not very good for music playback, if you are coming from a phone with dual front firing stereo speakers and play music game...you may not like it as you can easily block the speaker as well.
Video recording does not let you choose 1080p 60fps
only 30fps
It also lack water resistant and fingerprint reader if you are comparing to Z5P
My conclusion is that it is a solid midrange phone. The focus on this phone seem to be on the display, OS optimization and camera.