Re: Aerospace grade metal
A greater amount of information will be required to make a fair comparison-- specifically the price of the Mate 8 will be needed as it is released across the world.
Currently, I know that the Mate 8 has a price of around $600 in China's market. This price brings it near to the price of the Note 4 that is also selling for around $600. If we compare the Mate 8 with the Note 4 then, at this price point it seems that the Mate 8 is not competitive due to not having an S-Pen.
The Note 4 has a barometer, gesture, UV, heart rate and SpO2 sensors that are missing from the Mate 8. The Note 4 also provides 50GB of free cloud storage through Dropbox. On the flip side, the Mate 8 has a 4000 mAh battery vs. Note 4's 3220 mAh battery and a slightly larger screen. It all depends upon the price of the Mate 8 that will determine its competitiveness in the market.