The accuracy before calibration is alright. Although Samsung advertises that it has a dedicated sRGB mode, it isn't available in the list of Picture Modes, as you can see here and here. While colors are still locked to the sRGB color space, most colors are still inaccurate with a cold temperature, meaning they have a blue tint. The white balance is also awful, and gamma follows a 2.2 target instead of sRGB, so dark scenes are too dark, while bright scenes are slightly overbrightened.