Hi, just a few words about the Mate 8:
If you're more interested by an excellent camera or gaming, you might be more interested by some other brand.
If you need excellent battery life + excellent (!!) network connectivity + many email accounts + your mobile hotspot in your pocket, then the Mate 8 is definitely worth a try. I have found it to be an excellent business tool - nearly undisconnectable from the outer world. And it's quite stylish - never mind...
I've had two Mate 7 (one single SIM and one Dual SIM) and loved them - they are just powerhouses. 2 full days on the road with dual SIM / heavy data / mobile hotspot use (incl. 200 mph trains), without charging, is no longer a dream.
I got the Mate 8 now, and the same scheme just goes on. The Mate 7 was a great device and, from what I can say so far (after 2 weeks), the Mate 8 is a kind of polished version of the M7, with a slightly smaller battery (M7: 4100 mAh vs. M8: 4000 mAh), but with better Power Management. If you like the Swype keyboard, I'd recommend getting yourself a Swiftkey keyboard, because their native one is not overly accurate in that mode.
Enjoy !