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These, believe it or not, are four different phone models.
The only immediately apparent differences are screen sizes. The mid-range Xperia V (top left) has a 4.3-inch screen. The relatively budget-specced Xperia J (top right) has a four-inch screen and the Xperia T (bottom right) and TX (bottom left) have 4.55-inch screens.
The Xperia TX is a variant on the Xperia T that is targeted at Asian markets. It has a slightly different industrial design to the T.
Image credit: David Meyer