My wife and I both have matte black 128GB Verizon sevens. I picked up her phone last night after having just put mine down and noticed hers was noticeably lighter. She thought I was being an OCD freak, as I tend to be, but when I had her compare she noticed it too. Unfortunately I don't have a kitchen scale that can accurately measure grams to confirm my suspicions. Wondering if anyone else has noticed this and what could cause these variations?