Things get most interesting when it comes to the camera, as the Xperia Z1 is very snapper-centric, with 20 MP sensor and G Lens optics, against the 13 MP sensors of the S4 and G2. Samsung's and LG's brain kids, however, have proven already that they have probably the best cameras of all thin Android phones, whereas Sony has to still convince us in the viability of so many pixels stuffed into a sensor that is sized similar to the other two. Apart from that, it seems that we have a new king on the Android block with the Xperia Z1, at least on paper...
Source: http://www.phonearena.com/news/Sony-Xperia-Z1-vs-Samsung-Galaxy-S4-vs-LG-G2-specs-comparison-5-cage-match_id47068
Source: http://www.phonearena.com/news/Sony-Xperia-Z1-vs-Samsung-Galaxy-S4-vs-LG-G2-specs-comparison-5-cage-match_id47068