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The back key has moved through Xperias
On the
Xperia X10 on the Right side
From them on, on the left side
Xperia Arc
Xperia S
Xperia T
Xperia Z
Xperia Z1
Xperia Z2
Xperia Z3
Xperia Z4 Tablet
I don't remember which Xperia had it on the right side but a later update switch it to the Left side
Not sure why but I find it more useful like this,probably I got used this way. But I don't understand how can this help you,as samsung uses their touchwiz and sony uses android stock.
Anytime