Sorry to hear your not happy with the time it will take for us to release these updates for your Sony Xperia Z.
As a mobile provider we like to release software updates after it has been stringently tested on our network. Sometimes this may result in a delay. We do this to ensure the best experience for our customers.
I can't agree with you alpha123. My Xperia is unbranded and unlocked and I get this from Virgin and I can't do update via PC Companion. I asked Sony why I can't make update event if they already relase they told me update is depend from device. Same device get the up erlier same device leater :-/ Where was a point to relase new software If you can't make update on time???!!!!!