Sony's tablets have quietly been getting better over the years. Prioritizing refinement over dazzling new features, the Xperia Z2 Tablet and Z3 Tablet Compact were two of 2014's best. The Xperia Z4 Tablet is the direct replacement to the Z2, and Sony has ticked off all the right checkboxes in creating it. With its slim profile, super-high res display and all the latest chips inside, it looks like a dream on paper. Does it live up to expectations?