Why camera is behind? topic

I just wonder why sony z3 is sometimes behind imaging with other flagships especially when it comes to iPhone 6. In my opinion, iphone 6 takes way better photos except maybe in complete darkness where z3 ramps up iso. Is the camera hardware of z3 insufficient or is it the software? Can it be on par with other flagships if software is fixed? Auto in iPhone is much better versus in z3

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