A factor that should be considered is that the display case of the MK7 is set in an open area of a large shopping complex. This display case has lighting itself, but also reflections from the lights inside the shopping centre ceiling along with lights from other shop fronts and the sunlight coming in from the opening by the escalators. It took me a while to even get a semi-decent angle to minimise the several different light reflections.
It has been mentioned by several collectors already, photographing black objects is tough enough, but adding all the above influencing lighting factors make it even more difficult to obtain a decent image.
Have a look at the early section of this video tour I uploaded so you understand how the surroundings cause these lighting issues.