Yes - absolutely. You are entitled to 90 days screen breakage warranty as well.
Honor 8 has the wide aperture of f/2.2 for the rear camera and f/2.4 for the front camera.
Yes, Honor 8 supports VoLTE. You need to update the software, though.
Yes, Honor 8 does have LTPS Scratch Resistant (Low Temperature PolySilicon) glass, which is even better than gorilla glass.
Yes, Honor 8 is made of metal body covered by glass.