Our latest test scene is designed to simulate both daylight and low-light shooting. Pressing the 'lighting' buttons at the top of the widget allows you to switch between the two. The daylight scene is shot with manually set white balance, but the camera is left in its Auto setting for the low-light tests.
Under the tungsten lighting of our low light scene the D5300 neutralizes some of the light's yellow cast, but still leaves a moderate yellow tinge across the scene. At ISO 200 it's still defining purples and blues in the darker side of the scene fairly well. Moving up to ISO 800 there's a bit of color noise creeping into the JPEG image, with more fine detail rendered than the Canon T5i. Comparing to another APS-C camera, the Fujifilm X-E2, Nikon's JPEG processing renders reds slightly more yellow.
ISO 3200 shows that in low light the darker tones have started clipping to black and fine detail has take a significant hit. In low light at ISO 12800 the D5300's stronger approach to removing color noise is evident compared to the T5i, a trend continued at ISO 25600.
Comparing the D5300's Raw images to others in its APS-C class shows most of them to be on roughly equal terms regarding amount of noise. The "Canon T5i" shows about the same amount of noise at ISO 3200, though the D5300 looks to be slightly ahead. Above that setting at "ISO 12800" the D5300 is still looking slightly better; the T5i is showing more noise in shadow areas, and slightly stronger splotches of color noise in brighter areas.