It really shows the difference between how 5" and 4.7" look with the design languages they've chosen. The Xperia Z looks like it's pretty much the same size as the One, maybe a small bit bigger, but it is dominated by the screen and gives the illusion of actually being a good size larger, while the One is balanced in a way that causes it to appear smaller. For some people bigger is better, and for others, it's the other way around, but this gave a really nice comparison with how design plays a large part in how a device looks.
*commenting about something random because no one else will