I am great fan of Sony Xperia , My 1St android phone was Xperia x10 and until now Xperia phones all I have in my android craze.
Now I am using an xa for more than a year and it is a good phone because of its size.
I love 5 inch phones and I always prefer the size because its ease of use. I know many people have priorities like this. So there is a small suggestion from my side on the design which people will definitely like.
A 5/5.2 inch phone like xa2 with 2.0 Ghz processor from Snapdragon and 2 or 3 GB RAM will be enough. 3000 mAh battery with single sim ( nowadays all carriers are same) and the finger print on the power button like xa 1 plus. Rear fingerprint scanner is not feeling classy, side finger print maintains the Sony,s classy design and the convenience of use. And above that a black mettalic body will be an addon to the classic look.
I know the design challenges in this but It will be a great phone from Sony if you can design a premium one like this.
Thank you