Woah. Now some people like 16:9 ratio photos...
Maybe someday, phones use 16:9 sensor?
Back in old days, 35mm film is 3:2. Digital photography changes to 4:3 (still 3:2 for high-end/DSLR). Now 16:9 because of phone screen?
for who wants 13MP in Xperia Z -> you can't. That pixel and ratio is because of the hardware, not the software
If you want real 13MP in 16:9 ratio - you must change the image sensor (hardware that captures color and changes to voltage)
All for the sake of how it looks.