Camera Comparison From a Trusted Source

Shootout by DPReview. They review cameras (they are not a tech blog), so they are not biased.

Shootout: Sony Xperia Z1 vs Nokia Lumia 1020 vs LG G2 vs Samsung Galaxy S4 Zoom

http://connect.dpreview.com/post/4485507296/shootout-sonyxperiaz1-vs-nokia1020-vs-lgg2-vs-samsunggalaxys4zoom

Interesting to see how good the Z1 did.