I've noticed that in shoddy lighting situations (a la Target store) the 5s doesn't catch focus quite as easily. I was photographing a friend wearing a hat inside a Target around 10PM and I just couldn't catch a crisp photo of him even when I did tap the area where I wanted the focus. I'm an avid photographer and I do take the focus on my photos as seriously as the next person. I'm wondering if this is an issue with the 5s, since I never really had this problem on my old 4s. Thoughts?