Both bodies were pretty much out of the box...not sure what you are getting at here.
The out-of-box parameter settings for the two aren't quite the same. Add in changes in algorithms between the two releases and there's room for parameter adjustments to make the difference. One way to reduce the impact of this would be to shoot RAW with both and use the same post-processor to convert them to JPEG, using the same settings for saturation, contrast and sharpness. Note - DPP will use the in-camera settings by default.

