My xz looks simply perfect with blacks and natural blacks and colors.. Ion screen just feels like the samsung screens, over saturated with false colors..or there is some thing wrong with your xperia z screen.!It does look like a gamma calibration issue.
does android let you set the gamma settings via command line like on Linux?
eg. xgamma -gamma 1.000
Using linux as an example, it looks like the Z is set to 1.200 gamma, where .900 would suit most people's needs better.
Check it.
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lowered gamma to .75