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.
Comparing the E-M1 to the APS-C Canon EOS 70D in low light, you'll notice that the Canon DSLR handles the warm tungsten lighting a bit better than the E-M1, which has given the whole scene an amber tint. The low light also shows the E-M1's tendency toward JPEGs with stronger contrast. The AA-filter-less E-M1 shows occasional hints of moiré and false color, and the low light scene shows it more obviously. The lines in our resolution chart show some false color. The E-M1 does well keeping up with the 70D in terms of resolution in low light up to ISO 3200. Above that both cameras show a decline in detail, at ISO 12800 the 70D has applied a great deal of smoothing and the E-M1 shows a number of digital artifacts.
Comparing in Raw to the Panasonic Lumix GX7 at low ISO shows both Micro Four Thirds cameras with relatively similar noise levels. This holds true to ISO 800, though the E-M1 shows less noise in the red channel than its competitor. It shows about the same noise levels as its APS-C DSLR competitors, though noticeably more than the Fujifilm X-Pro1 with its unconventional X-Trans sensor.