The difference M1GU31 though between your TV and thecreature's is, yours is 1920x1080 where his is only 1366x768.
The one thing I can see from looking the model up that thecreature has is that Sony are idiots and used the same specs for all TV's in that series, and only changed certain parts depending on model. The manual for that TV even goes so far to be for a range of models (14, from a 55" all the way down to a 22"), that range from 1920x1080 to 1366x768. Think you will find that is what is leading to thecreature's confusion as to why he can't get it to display at 1920x1080.
thecreature, your TV is 1366x768 only and that is why you can't set it to 1920x1080 so there is nothing wrong.