You didn't get it during that Amazon Prime day by any chance as I heard from my friend the Gold one had gone for around that price on the day which was a mad price considering.
Even madder now Amazon have hiked the price up quite a bit to the normal price been nearer the Sony RRP.
I could certainly get used to the weight if it came up at that price again!
Personally from what I heard between the 1Z and my 1A is the Gold one is a superior sound in terms of clarity and control and more resolution but could never justify the normal price difference for the extra perfomance much as a old school ES fan I am with that gold finish is sublime and back to their old best with that eye for design detail on both the ergonomics and UI implementation side of it all.
But if it ever did come around at the £1500 mark again I would certainly think about it weight of a Gold bar or not regardless at that price.