Competition between smartphone makers has them pushing the numbers up, up, up and one that increases with each generation is the screen diagonal. And the prestige of a big screen is coupled with big specs while small screen phones are perceived as "low-end" and the specs of phones reflect that. There's the exception to that rule - super minis, compacts, whatever you call them they are few but famous. The Xperia Z Compact was perhaps the best known of them and this week it got a spiritual successor. The Xperia X Compact showed that you can have both a 4.6" screen and an awesome camera....
Source: http://www.gsmarena.com/weekly_poll_results_mini_flagships_showered_in_love-news-20309.php