I have been using iPhones since day one in 2007... I currently have an iPhone 6+ and I am a professional photographer.
My wife got a Samsung Galaxy S6 Edge the other day...
We were having lunch, in the shade, and it was a super bright day with blue skies and some clouds.
I asked her to check the camera on the Samsung... If you know anything about photography, the situation is one of the toughest ones to photograph. Basically a person in the shade, with a bright background... I was literally blown away!
Not only the screen is brighter, sharper and more colorful than the iphone but the dynamic range of the Samsung blows the iPhone away by a huge margin.
Her face was lit normally and the background had a light blue sky and even the clouds were present. And this is not even on HDR mode!
I compared side by side the 2 phones and the iphone wasn't sharp, had no contrast and the sky was completely white and blown out. Even on HDR mode, the iPhone couldn't resolve the detail and dynamic range of the samsung.
I would NEVER own a Samsung, as phone, but I was extremely impressed with its camera.
So, Apple needs to step it up on the new iPhone 6s and 6s+. It's ridiculous to have a whole campaign about how good the iPhone camera is, when it actually sucks in comparison and it's years behind on Megapixels, F-Stops and Dynamic Range.