Best camera - Sony Xperia Z2/Z3C or LG G3?

Looking to buy an android phone from an iphone 5 (don't want the samsung bloatware). We have got twins in the family and want a phone with a better camera including 4K video, also bored of Apple iOS.

I've narrowed the choice down to either a Sony Xperia Z2 or Z3 compact or an LG G3.

Considerations:
- I've gotta convince my wife to sell her iphone 4 to take my iphone 5 so I can buy the phone so cost is key, so I can't afford the Xperia Z3.
- I already have a Nexus 7 2013 and love the stock android clean interface.
- The Sony Xperia line looks good