I heard a few reports about the matte black finish coming off from iPhone 7 by daily usage without a case. Personally i have the matte black 7+ and keep it in a case most of the time. I did not experience the finish coming off until now. Here is a video about the issue from a german YouTuber: Scroll to minute 8:00 to see the issue. He says the iPhone is not smudgy and he did not treat it bad. A friend of him has the same issue. Does anyone of you experience similar issues?