Xperia Z is by far one of the best designed phones ever. The look and the structure of the phone is amazing, feels great in the hand, except for the smudge marks that readily form. The camera performance in low-light may not be at par with the HTC ONE but the overall performance is true to its claims.
Great controls provided by sony for easier use also, for example you could just connect your earphones which would in turn automatically start playing your music and any new text messages are read out to you. 3D applications work like a charm as well. To top it all the shatter proof and water proof features are an icing to the cake.
In our country with all the rough usage we go about, I believe these features set the phone apart. I have no regrets in getting this phone. Its top notch and shall stay that way. Kudos.