The issue is that the iPhone 6 has a more scratch prone glass. The 5, never seemed to incur scratches like the 6 can.
I have never scratched the glass, but I have had small scratches in the screen's oleophobic coating. I only notice them with the screen off, or with very dark content. If you are worried, there are different kinds of screen protectors that feel differently to the touch.
I'm considering getting a glass protector.
I have a hairline scratch on my 6 and it bugs me. I never had one on my 4, and only got a nick on that with a stupid fall at Comcast (blaming them), and otherwise it was not intentionally babied.
But I would say this one is more scratch prone.
I just despise screen protectors.
You can't poll to determine if it's worth it to you. It's a call that you have to make. Whether others scratch their screens or not doesn't really mean anything with regard to whether you will or not.
Naked is good till it scratches, so why take the chance. Enough said