Opticontras TFT (Xperia TX, B version) vs TFT Xperia Z

That is Sony previous firmware issue for xperia Z.

Latest firmware which release few days ago - v10.1.1.A.1.253 had completely fixed the display issue.

.253 improve the viewing angle. Actually I already know Sony can tune this as during .434 ROM, I already notice viewing angle is much better when viewing photo/video at Album. The color punch up in BE2 is better the viewing.

Now Sony fixed at .253, which eventually getting better view a lot as it not only vibrant it, it also with correct white balance, better contrast level as well.

If you not believe this, you can go XDA forum, everyone talk about it.

Or go find two units of Xperia Z, one with .434 firmware, another with .253 firmware, and you will seen the different. v.253 is latest firmware instead of .434, all this confusing is due to it is actually 10.1.A.1.434 v/s 10.1.1.A.1.253

I believe Z viewing angle is same standard as V just Sony did it wrongly in white balance tune, contrast adjust and color vividness control when launching.