No Marshmallow in my XPERIA Z5

Hi,
I just got the new Xperia Z5 from Vodafone. but it has android 5.1.1, I tried using the PC and OTA but still can't find the 6.0 for my device.

Any idea what could be wrong? or is its not released for this one yet.

Xperia z5 e6653

from xda-developers http://ift.tt/1VXQo7p
via IFTTT