The accuracy before calibration is decent. The sRGB mode locks the colors to the sRGB colors space, so they don't look oversaturated. However, some colors are still off, and the white balance is terrible. The color temperature is also much colder than the 6500K target, giving the image a blue tint. Gamma doesn't follow the target sRGB curve well either, as most scenes are too bright. The sRGB mode also locks some picture settings, so if you want more customizability, you'll need to use another picture mode that has oversaturated colors.