For me, M8 needs to be on par or exceed the following in order to "win" S5
Processor
dont care since original one is fast enough
Design
Nothing stand out to me about S5's design. I do like side power button tho.
Screen
dont care i am pretty happy with original one display
Battery
- 2800mAh. standby time: 390 hrs / talk time: 21 hrs.
- ultra power saver mode is pretty desirable
Camera
- "fastest auto focus" that is one feature to beat
- real time HDR is pretty neat
- 16MP is pretty desirable. Hope m8's dual cam can out shine this in actual shoot out
- Selective Focus takes a few seconds, and not flawless as it takes two photos a period apart rather than the same photo at different depths. m8 should be able to beat this
- 4k vid recording is awesome, but probably over-rated. as it takes up too much space for it to be any way practical
Connectivity
- LTE Cat4 (up to 150Mbps downloads and 50Mbps uploads, network depending),
- WiFi AC: I really would like that Wifi AC capability on m8!
software
- User interface: it already lost me in this category. it looks too much like ios
- 8GB of android + bloatware ... m8 needs to capitalize this
- What will really seal the deal for me is if htc announced stock android or a way to not lag behind with updates
Other features
- Fitness stuff would be nice to have for some, but will be bloatware for others
- fingerprint scanner / heart rate sensor: dont care
- water / dust resist: if it's not water "proof" it's just gimmicky