Well I've had the Z2 since Thursday, and let me tell you this... it's the best phone I've ever used! It seemed REALLY big at first, this is coming from an Xperia Play, the size difference is enormous, but after a while you get used to holding it anyway, and I've ordered a leather case/wallet (Y'know those foldy ones, this has card slots too which is handy) which will be here tomorrow, since I'm always scared of what will happen if I drop it, it's my baby!
The camera is better than on the Z and Z1 apparently, so I suppose it's unfair to comment there, but it really does take some gorgeous pictures and the 4K video recording is great too! Not to mention the screen is insane, the colours are amazing and everything just pops on the phone!
Battery life, well I always put my phone on charge when I get in from work anyway, but today I didn't... it was on 100% at 5:45pm (When I set off to work, I unplugged it at 100%) and it's beside me now, at 2:20am at 92%, and that's with some facebook and internet usage, so it's not too bad really.
I can't comment on customer support when it comes to THIS phone since I've only just gotten it, but in terms of Sony support with phones in general, when I first got my Xperia Play, a few weeks later my cat knocked it off the table and it landed with a dint on the corner and the power button and volume buttons sort of... fell off, lol. I called Sony up, and within minutes we'd already arranged for them to exchange it, very few questions asked lol... one of them was "What's your cat's name?" ...George "Is George around?" ...Yes "Put me on loud speaker" ...*Puts loud speaker on* "George you're a very naughty boy!" It was actually pretty funny lol, the lady was really nice!