Hello. I own Sony Xperia Z1 C6903 (my personal) and Sony Xperia Z2 D6503 (my wife). Both have Android 4.4.
But there is a big difference.
Although the camera module is the same replacement (1271-4830), the result of photos and videos taken is decidedly different.
Z1 has a bad photo / video camera.
Z2 has an excellent photo / video camera.
Operating system and camera software are identical. No different options.
Is it possible to drastically improve the quality of the Z1 camera?