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try to check your camera settings again. set your resolution to 20 or 23 mp
http://talk.sonymobile.com/t5/FAQ/Xperia-Smartphone-Photography-Improve-your-smartphone/m-p/1124298#...
is it the same when you are in safe mode?
try to perform software repair using Xperia Companion
if you are still not satisfied with the quality then you can send your device for check up at your local service center Local support