Trunk comparison: Audi Q2 vs Ford Focus Wagon

Summary
The Ford Focus Wagon offers significantly more space in terms of cargo volume, especially in length and width: with the seats folded down, the trunk of the Focus is 15.4 in (27%) longer than that of the Audi Q2, and with the front seats upright, it is 10.2 in (33%) longer.
Additionally, the width at the narrowest point in the Focus is 5.5 in (14%) greater and the width of the trunk opening is 5.5 in (15%) larger than in the Q2. The Audi Q2, on the other hand, scores with a significantly greater interior depth (loading edge to trunk floor): this is 3.5 in (450%) higher in the Q2. The loading edge of the Q2 sits 5.1 in (21%) higher above the road; the trunk opening height is indeed 2.4 in (8%) higher in the Q2, but this difference is under 10% and is not emphasized here.
Impact on Usability
For longer or bulky loads (e.g., furniture, long items, skis), the Ford Focus Wagon is clearly more practical: the greater cargo length with folded seats and the larger narrow width as well as the wider opening make it easier to load long or wide items and allow better utilization of the cargo area.
Especially when transporting longer items without folding down the rear seats, you benefit from the additional 10.2 in in length.
The Audi Q2, in contrast, offers a significantly deeper trunk structure below the loading edge. Practically, this means that items can be recessed further down (e.g., deep bags or boxes), which changes the visible and usable interior space.
Combined with the significantly higher loading edge above the road, this makes loading heavy items ergonomically more demanding: the higher loading edge means more lifting effort when loading and unloading. The slightly greater trunk opening height of the Q2 (8%) is only a minor compensation.
In short: Those who regularly transport long or wide loads or prefer ergonomically easier loading and unloading are better served by the Ford Focus Wagon.
Those who benefit from a deeper cargo well and often store rather low, bulky items below the loading edge will find an advantage in the Audi Q2 — but must overcome a higher loading edge.