Well, you are not alone.
I complained about the camera and other problems to my local Sony Mobile representative. I took my Xperia SP to the service center where they examined the mobile phone and returned to me as working according to the manufacturer's specifications.
I'm ashamed to post any picture taken with Xperia SP on Facebook or elsewhere. Grainy and sometimes blurred images is all I get. I tried to change camera settings manually, but didn't get any real improvement.
I have no idea what to do next since there isn't anything that I can really do about this problem with the camera.
