This is a great, big question for many users of C6903: if the quality of the camera is the same for locked and unlocked bootloader. But opinions are different. Finally I believe in your answer, being a name on XDA developers. Thanks.
Xperia Z1, rooted, unlocked bootloader, JB (KitKat brings me nothing, maybe troubles with camera!!!)
They only "work" on the device itself anyway so pictures taken with the camera and uploaded to another device will not be effected.