It's hard to comprehend just how big a device with a 6.4-inch display really is. The Samsung Galaxy Mega 6.3 seemed absurd when we first got it in our hands and as quick we humans are to adapt to novelty, it seemed just too large even after we spend some time with it. The size comparison below is eye-opening - you'd see that the Xperia Z Ultra is noticeably larger than even the Mega 6.3.