OK I have the Xperia M!
On latest firmware 15.1.A.1.9
Bought in Germany
SI code is 1274-1587
Screen is great! If you put it on full brightness you can see how beautiful it is.
Honestly, I think my Xperia Sola from 2012 (reality display, bravia engine 1) had a *slightly* better display, but not by much
The light effect at the bottom is quite bright and attractive
Earphones are OK, but if you have a better pair, use them
Very fast, very smooth. 2GB user space, 1.74 available