Lightweight cameras yield dark photos
The most obvious way this affects images is in low-light quality. Remember, the makers of large cameras have their own geniuses improving them too. Often, they work down the hall from each other. (Hello, Sony sensor juggernaut!) So while cell phones have gotten better and better at turning indoor locations into something decently recognizable, large-sensor cameras have gotten INSANE at low-light.
You’ve probably seen the ISO level on your phone’s manual settings. ISO represents the camera’s sensitivity to light, and as it increases, you can take shots in darker conditions. The tradeoff is visual noise: your photos will look more like they’ve passed through a dust filter.
Even good phones turn to extreme noise reduction by the time they hit ISO 800. On a 1-inch sensor camera like the Sony RX100, you can take passable photos at ISO 6400. On the D5, if you're willing to use cell-phone level noise reduction, you can shoot decently at ISO 100,000 (or nice and crisp at a "mere" 20,000 or so).