Sony xperia z3+ was an upgrade to z3 it is launched as z4 in smone countries like japan etc but I did find any much difference between z3 and z3+
Sound reciption is very good clearity is also nice, as its has two front facing speakers its very good and convinent to watch movies or play games
Design is quit same as of other sony z series looks very cool but feels very much slipery while handeling without cover
Its give us snapdragon 801 processor so it has little heating issue specially while using camera you cant use camera for more dan 15 mins continuesly but clearity is dam awsome as it comes with 21 mega pixel shooter at the back n 5 mega pixel shooter at front
It comes with amdroid 5 but its upgradable to android 6 and may be even 7 so its definetly value for money n nice powerful cell at its price segment