The Huawei P9 smartphone is all about the camera. It's decent looking phone with a rather sluggish software but its Leica-branded dual-lens camera is one of the best I've seen so far and makes the P9 worth every penny. For those who are not familiar with Leica, it's a camera brand that "was founded on a long tradition of excellence in the construction of lenses and optical devices" and it has teamed up with Huawei…