I would start with how I bought this. Yesh buying this was mere coincidence happened with me. Well I went to buy Xperia SL but at that time it was not in stock. So the shopkeeper gave me an option for Xperia Z to buy.
I was stunned with its looks and the glass that was used at the back portion. Then I was told about its specs which were excellent too. So I bought it.
Since then it had been a revealation of features for me every passing day. I had great fun with this. The camera used houses a 13 mp shooter which gives mesmerizing captures.
Tull now I have not faced any sluggishness or lags onto it even it is capable of handling games like ASPHALT 8 and Gta sanandreas. Superbly it played all.
Althought the battery is a bit disappointment for me which stays only a full day on moderate use but when played games like mentioned above then you would have to charge it twice a day.
I am very much satisfied with this even with android 5.1.1 it is very very smooth. Gives a top notch performance being a 2013 device.
Conclusion- you can still look out to this device. And can enjoy all sony experience with this. If you want to go with a cheap device having all features that suits anyone and from a world class brand. Then bring this beast home.