XperiaBlog: Sony Mobile is revamping its model numbers from 2013 onwards. Gone is the ST/MT/LT code structure to denote small, medium and large touchscreen handsets. Instead what we now have is a new five character model number that will be the new standard going forward.
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I will say, though, that it is getting increasingly hard to stay away from these new Android phones.
They're improving all the time and offer many features the iPhone will probably not get for many more years, sadly.
I personally prefer Android now that I have gotten used to the OS. The main thing about Android though is it supports dozens of phones. So I don't get Android for the OS but for the phone itself.
The Galaxy Note will be mine someday.