Hi guys, Just wonder do you think the iPhone screen glass has become more scratch resistant over generations? My first iPhone got a small scratch (4s). My 5s was tempered glass protected but my boyfriend has a naked 5s and no scratches. But being a guy theres no handbags or earrings for him. Was wondering if over generations it's gotten better. I have a 6 now so would it be stronger than a 5s? Is "ion-strengthened" better?