Trunk comparison: Audi A6 Sedan vs Durchschnitt Wagon

Key Differences
The Audi A6 offers a significantly longer loading floor lengthwise: +8.7 in (13%) with seats folded down and +5.9 in (15%) with the front row upright compared to the average wagon.
The trunk depth (distance from loading edge → trunk floor) is +3.1 in (200%) greater in the A6. In contrast, the average wagon has a considerably taller trunk opening and a wider opening: the opening is +11.4 in (58%) higher and the width of the opening +3.9 in (11%) larger than in the A6. Smaller differences (loading edge +1.2 in / 5% higher, narrowest width +0.8 in / 2% larger in the wagon) exist but are less relevant.
Impact on Usability
Due to the greater loading length, the Audi A6 is better suited for very long items (e.g., slats, skis, long furniture parts) and for transport when seat rows are folded down.
The significantly greater depth between loading edge and trunk floor in the A6 increases usable volume in length/depth direction and facilitates stacking low boxes or storing items that fit below the loading edge.
The average wagon has an advantage when handling tall and wide items: the significantly taller trunk opening (+58%) and larger opening width (+11%) make loading bulky, tall, or wide-format cargo (e.g., furniture, boxes, bicycle frames) easier.
A higher opening reduces the risk of parts or boxes hitting during loading or unloading.
Practical conclusion: For users who mainly transport long, flat, or deeply stackable cargo, the Audi A6 is more advantageous. For users who more frequently need to load tall or wide, bulky items or value easier loading of large objects, the typical wagon is better suited.
Smaller differences like the slightly higher loading edge of the A6 (+1.2 in / 5%) make lifting marginally more strenuous but are secondary compared to the differences mentioned above.