I auditioned the Focal Kanta 2, 3, then the Sopra 2 and 3. Ended up taking home the Kanta 3s which weren't far off the Sopra 3 with bass output, but Sopras had a more pronounced mid-range. Stepping down to the 2s was a noticeable drop in bass output on both models.
My room is slightly larger than yours with vaulted ceilings, and the Kanta 3s easily overpower the room with bass without proper treatment. Basic room treatment is a must, but I personally do not feel the need to add subs with the larger 3s.