Difference Between Sony Xperia Z and Sony Xperia ZL

The following points differ in Xperia Z and Xperia ZL:
1.) Build : Xperia Z has a glass back while Xperia ZL has a mat finish. Thickness wise Xperia Z is far more         slim at just 7.9 mm. Xperia ZL has the least screen-basel ratio currently in the market making it very comfortable to hold.
2.) WiFi : Xperia Z supports only single band wifi at 2.4 GHz only while Xperia ZL supports dual band wifi at 2.4 GHz as well as at 5 GHz. Hence, in that ways Xperia ZL is a clear winner.
3.) Durability : Xperia Z is IP57 and IP55 certified for being water and dust resistant respectively. While Xperia ZL is neither dust nor water resistant.
For more info on single and dual band wifi visit https://community.republicwireless.com/thread/7282
For more info on IP57 and IP55certification visit https://community.republicwireless.com/thread/7282