Well the SGS5 is more dust resistant but less water proof at IP67 The Z2 @ IP58 is more water proof but less dust reistant. The first number is dust resitance, the second number is water resistance. I had to look that up, I was really curious! IP Code - Wikipedia, the free encyclopedia I think its weird that the sony is less dust proof but it is more water proof. how is that possible!!!??!!? LOL I wonder if Samsung's IP rating is a claim, OR it is REALLY certified. My thinking is that the headphone jack gives the Z2 a 5 rating in dust. If that is the case. It would as well for the SGS5. It doesnt make sense. Im gonna have to do a little more digging to figure this out.