Samsung&#39;s Galaxy J series smartphones have been around for a while now and the company just updated the J7 and J5. According to Samsung, the J series is &lsquo;highest selling smartphone series&rsquo; in India. The two new phones offer an upgraded specification sheet and metal frame. This makes&nbsp;the phone better,&nbsp;compared to its predecessors, but is it good enough in the current market? Here&#39;s a closer look.