Basis on my extensive use of Honor 8 for about 4 months, I can say that these are the biggest advantages of Honor 8.
01) Super Aesthetics
02) Superb Camera Quality
03) Good Internal Software
Yes, Honor 8 has 3.5 mm music jack.
Yes, it does support various smart gestures. You can customise them.
Yes, you can play 4k videos on Honor 8.