Share your experience!
Here's my problem: When texting, a semitransparent rectangle appears above the letter I use and it is moving, depending on the letter. I thought it is a software problem, but even after reinstallation, using Update Service, there was no change. So I returned the phone to my mobile operator for service. Anyone facing the same problem? Google says nothing about it, so I decided to ask here. Hopefully someone helps! Thanks in advance! 
When you press a key on the keyboard a bigger image of the key appears over the pressed key. It's not that one you mean?
Can you try to take a screenshot on it so we can see it?
To take a screenshot, press and hold the volume down button and the power button at the same time.
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I know that you are getting this semitransperrent rectangle while typing in Landscape mode only..
You know what, you not the guy to face this issue.. all of the tipo have this issue.. I just didn't raised it here coz I'm tired posting issues here and waiting for solutions for months but finally you get "Nothing but the frustration".. 
Why could company like sony can produce device with lot of bugs? I was fan of sony before but since I purchased this device, I feel regret each and every day I see my phone. If I go to resell this brand new phone, then it is not giving me more that 30% of purchase price.. 70% lost! So can't resell it...
Thats the whole reason I didn't bought Xperia Z... Although its a great great device but I just lost trust in sony!
And thats the reason, although Z is great device but got beaten by samsung galaxy s4.
Sony is more and more focusing on Tech Specs on white paper and still wondering how samsung is moving so faster? The answer is simple.. sony's antitrust policies..
One of the greatest things about sony was Innovation but nowdays fixing problems is also like "innovation" to them..
UPDATE: After 2 weeks of waiting, my mobile operator gave it back to me with the problem still staying. In the warranty it is written that they had installed v11.A.0.4.22 (downgrading from 11.0.A.4.27, which is also official, but still not available in Update Service) and that's it. And then, suddenly, I found the reason why I notice this factory defect now, after 8 months of using, without any problems. I'll tell you why - just because 3 days before I removed my last screen protector and for a first time I had no new left to put on. The conclusion is: fabric defect, which obviously cannot be removed and the only solution to make it invisible is putting a screen protector on the display. Nevertheless, I'm still happy with my phone!
Cheers!