So on my iPhone6 it fits perfectly. Of course, the glass can not come up to the corners well. As well, then yes round and would be in the air. With sheath around it in any case not a problem and the display is also completely covered.
What could be improved, would the fingerprint sensor area. A little more notch would not feel so weird. Scratches I have already two in there, but this, it is there for. 10 still better than plastic sheeting.