Take a look at this crop:Actually the z2 with its 20.7mp camera uses pixel binning, which doesn't end up being a 20mp image. It ends up being an 8mp image, same goes for Nokia's camera's. They advertise 41mp but in all reality it ends up being a 5mp image. Look it up.
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Take a look at this crop:
http://img.tapatalk.com/d/14/04/06/emy2a6ys.jpg
M8 clearly lacks detail due to its lower pixel count,well Z2 looks out of focus .
More samples here
http://www.eprice.com.tw/mobile/talk/124/4899661/1/rv/sony-xperia-z2-review/