Below are two photos from brunch today. One was taken by a friend with an iPhone 5s. The other by me with an admittedly rather bulky standard camera (Sony NEX-6 with Sony/Zeiss 16-70mm lens). The light level was fairly similar, on opposite sides of a table. It was fairly bright by indoor standards, with a lot of window light reflecting off white walls.
As you can see, the camera phone picture, despite having come from a state-of-the-art phone (iPhone 5s), is painfully noisy (“grainy” as we film dinosaurs might say).
I can understand the rage for thin and light phones but with more than 7 billion people on the planet I would think that there would be a market for a thicker heavier phone that could deal with indoor photography more gracefully. Samsung has tried in this area a few times (e.g., this Galaxy S4 Zoom camera) but somehow consumers aren’t buying.
[If you're curious to see more photos with this fairly new lens, I'm building up an examples folder. At first it seemed as though the lens would be unbalanced on the small and light NEX-6 body but I have gotten used to it.]