Conclusion:
Model S and X has the same space if 2nd and 3rd row are loaded with cargo. Model X has more space if 2nd row has passengers.
Jørgen Winther-Larsen and I test the cargo capacity with Model S and Model X. In this test, I used 6 seat configuration Model X. A 7 seat configuration will have less space and therefore be beaten by a Model S if 2nd row are folded/pushed forward.
