I like this combination of Sony A7R3 and Sony Zeiss 35mm lens, which is mainly light. The 35mm lens is only 120 grams and it is the lightest lens I have ever used. This one has fast focusing and better color than the original 35mm1.8. Plus, the metal lens hood is my super favorite.
Jason 
Molly A 
Miri Wong 
Ken Cheng