The Xperia L1 marks Sony's return to the still growing and highly-competitive entry-level market. Putting together a good smartphone for beginners can often turn out to be an even tougher task than designing a flagship. Maybe that's why Sony is retiring its E-series and introducing a new contender in the Xperia L1.
Source: http://www.gsmarena.com/sony_xperia_l1-review-1624.php