I'm ready replaced my wife's nexus 4 with the Z3C. I'm insanely jealous of her phone's battery life compared to my n4.
I almost grabbed a Z1C off of eBay but am really trying to hold out until post holiday.
Z4C would be perfect, drop the 3s price real nice like.
Posted via Android Central App
I have just done exactly this. Replaced my N4 for a Z3C and I haven't looked back. I can highly recommend this phone. The biggest selling factor for me was the fact that the Sony's are so stripped back in terms of OS, very close to the stock android like on the N4.
I installed Google Home launcher and all the other Google apps and it's virtually the same + in my opinion better settings drawer options and a better laid out settings menu + battery saving functions.
I'm a fairly heavy user, so 2 days (according to Sony) is not possible, but I definitely get a whole days use out of it. On Friday last week I used it through the day on WhatsApp, sent a few emails, used it for 45mins on WiFi hotspot over lunch for Netflix on my Nexus 7, then listened to music on the way home from work for an hour in my car, went to a friends house for drinks and used my phone as a music player and a virtual pack of cards for drinking games - being waterproof this is perfect. By 2am I was drunk and browsing funny videos on reddit whilst falling asleep on my friends sofa with around 12% battery left, if I remember right. It was dead by the morning.
This post has gone on longer than planned but hope it gives some real world insight into how good this phone is! Z4C i can imagine will only be better but like the above said, it will also push down the Z3C price!