Z1 vs LG G2

Hello, I'm planing to change my smartphone, an old Razr I. I have in mind to go back with Sony and get a Xperia Z1 or a Xperia Z1 compact, upon availability, but I'm also thinking to get an Lg G2

I have never owned a Lg Phone, not even a feature phone, I have some doubts

how good is the camera? Specially in low light conditions

How is lg with updates? I know the phone is on KitKat, but it will have more updates?

Build quality, I really don't like bad quality plastic, that's why I'm thinking about getting the Z1