No. Honor 8 camera does not come with Leica branding.
Yes, considering the display size and battery capacity, Honor 8 is quite light weight. It weighs just about 153 grams.
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