I have recently returned from Venice from a two weeks trip.
I have put to test my new Samsung Galaxy S6's camera almost every day during this trip.
Very sharp, very clear, low grain at night shots high quality and large image files.
I also did video with it. Especially at night during almost pitch black situations its capacity shines though.
Here is an example.
To see the files larger just click on to the images.
After editing, the result is below. I just did bring out the details and used Noise Ninja to smoothen the grain.
And the video sample.