I think I already posted a while back in this thread but I'll update my experience. If I hold my phone out in direct sunlight I can notice quite a few very minor scratches. Some very short, maybe a 1/4" long, some longer about an inch long. I treat this phone exactly the same as I have my previous 4 iPhones(yes that is 4 years of iPhone devices) and I have more scratches on my Lumia than I do all 4 iDevices put together. Now thankfully the scratches are not terribly noticeable, and mostly only in direct sunlight but I'm disheartened to say the least. Especially since the phone is always in my pocket with nothing else in the same pocket, never set screen side down on a table.
The kicker though, is I have all of these scratches from who knows where, and then yesterday I dropped the phone out of my pocket(first time I've ever dropped this phone) straight onto a concrete floor from chair height and not a single mark hahahaha. Concrete is no match, but apparently pocket lint is :winktongue: