The Verge:
For the longest time, the prevailing trend with mobile phones was to take last year’s handset and make it smaller. Shave a few millimeters off, shed a couple of grams, and give users the same experience but in a leaner shell. The rise of smartphones and their incessantly improving spec sheets derailed that habit, but now Sony’s returning to the old ways with its new Xperia Z1 Compact.
TechRadar - Apple has long argued for the merits of a smartphone you can use one-handed, that's why the iPhone 5S grew taller, but not wider.
The idea of a scaled down flagship isn't alien to the big Android OEMs, but Sony is the only one so far to avoid scaling down the specs when it shrank the phone, which is why the Xperia Z1 Compact is the current king of smaller Android smartphones.
HardwareZone: Miniature versions of flagship smartphones generally come with watered-down specs such as a slower, less advanced processor, less RAM and weaker imaging hardware.
ThatNaijaBlog -The Sony Xperia Z1 follows the likes of Xperia Z Ultra which came with a physical button to hard reset your smartphone. Sony has really got things easier and less confusing, so if for any reason you want to hard reset your Xperia Z1, all you need to do is to locate the “OFF” button.