Sony Xperia Z5 Ultra expected out in March 2015 with SD820, 4K 6.44-inch screen
 

Those who find the Xperia Z5 Premium too small, or its 4K visual experience not immersive enough, may want to hold off until spring. Sony caught us all off guard when superseding Quad HD smartphone displays at the recently finished IFA 2015 trade show, and taking the mobile spec wars to new heights of insanity....

http://vr-zone.com/articles/sony-xpe...een/98687.html