HTC one m8---Quad-Core Krait 400 CPU 2.3 ghz\ 5 inch screen\ 2 gigabytes of RAM and supports micro SD
Battery 2600 mAh
pros in my view powerfull four core phone with a future
beautiful sexy look and also good camera
cons in my view weak battery.too much expensive
Sony xperia Z2-------Quad-Core Krait 400 CPU 2.3 ghz \ 5.2 inch screen\3gigabytes of ram
battery 3200 mAh
pros in my view powerfull phone four cores good future
awesome battery bigger screen and etc
cons in my view not so much good in terms of speakers and sounds (good but not good as M8)
IN MY VIEW OVERALL Z2 IS BETTER