Just noticed this on my iPhone 6 -- it looks like there's a small rectangular area where the oleophobic coating didn't take. You can see in the picture below:
If I clean the area, it looks like that again as soon as I touch the screen. The rest stays relatively clean.
Any of you guys have a similar problem? And would you try to get it exchanged for such an issue? My phone is otherwise perfect

If I clean the area, it looks like that again as soon as I touch the screen. The rest stays relatively clean.
Any of you guys have a similar problem? And would you try to get it exchanged for such an issue? My phone is otherwise perfect