If you bought an iPhone 6 Plus between September 2014 and January 2015 and your photos look blurry, you're not alone, Apple is aware of the problem and will replace the camera with no charge. If you think your iPhone is affected, here is how to get your camera replaced: https://www.apple.com/support/iphone6plus-isightcamera/
Note that Apple won't replace the phone, they will just change the camera.
Mine is affected. My Shield Tablet with the battery problem, now this. Oh well.
Source: http://www.theverge.com/2015/8/21/9189893/apple-iphone-6-plus-camera-defect