The Olympica III will be fine in that room. They have a ton of bass output for their size. Crazy really how much they put out. I demoed a pair a few weeks ago and really liked them.
I use smaller speakers about the size of the Olympica II in a 25’x27’ deticated room and it is fine but I sit 10’ way and most of the room is not used actively. It come down to how close you sit.
In my living room my wife has a pair of paradigm shift A2 speakes (I think that is the name) in a 19’x26’ room. Those A2s have tiny little active 5.25” drivers and they more than fill the room with background music and in the “sweet” spot are perfectly fine. it is not about how big the room is but how far you sit from them and how many people you want to hear them at the same time. Most hifi rooms are really only good for one or two people to actively listen.
I have not heard the Sopras but focals in general are a lot more aggressive in the mids and highs than the sonus faber Olympicas. They might sound aggressive played loud in a big room. I always liked them but I tend to like a lean and mean speaker. Just try both the focals and sonus faber, they are different enough you should have a clear winner.
Now if you want want to play crazy loud and rock the whole house as you walk around there are probably better speakers with bigger drivers from maybe legacy audio with duel 12” drivers like the Focus SE. They are around $12k I think.