I had both Samsung Galaxy and Sony Xperia, both are amazing devices.
Camera
Anyway, in other tech sites, Blind Camera comparison tests (wherein the people were shown sets of pictures taken by the latest smartphones, but they weren't told which pictures were taken by which brand. So they would have to choose the images they think best without bias) After a week of poll, the pictures taken by Samsung had the most votes. Even though Z1 has 20 Megapixel camera, it's not significant compared to the image's quality. The higher megapixel, the larger and "denser/clearer" photo you can print. Z2's camera is little better than the z1's due to software tweaks.
Build
Sony Xperia z1 or Z2 has great build. If you'll go for the black one, your...