I got the same or similar but let's not kid ourselves that this is in any way small. It would have been giant by 2015 standards. That's how much the overton window has shifted.
1) 2015 saw the iPhone 6s, which was only 15 mm shorter than the Xperia 5 or 10 V, while being about the same width and thickness. It had a tiny screen in comparison. The 6s Plus was larger, and heavier, than the Xperia 10 V, in all dimensions (OK, not thickness, this was the time of "paperthin" phones) while still having a smaller screen.
2) I don't want a tiny 2008 smartphone, I want a phone I can use with one hand. A width of 70 mm or less lets me do that. Today, that is small, in 2015 it was about normal.
3) My perfect phone was the Samsung Galaxy S6 Edge from 2015, which has about the same dimensions like the Xperia 10 V but the rounded screen edges made it easier to use with one hand.
