In my opinion, the 7 series is not as good as the design of the 4/5 series but better than the 6 series. I hate the antenna bands on the back on my iPhone 6 and I think my gold 5s was by far the most beautiful looking phone I have ever owned. I would have loved a 4.7" version of that, with thinner bezels.
At least the 7 series has moved the antenna bands to the top and bottom of the phone, which makes for a much cleaner back.