That's fine, I'll take the risk.
Sointuva are passive. Devialet are not comparable, being marketed for a more mainstream audience. They extend very deep, but they don't sound right at all. LS50W2 are good, but they do not hit very low. Formation, I have no clue, I still need to give them a listen.
Now... the SF Duetto. As
@boXem said, it was pleasant to see that the actual designer, who was there for the demo, really knew his stuff. Still, for 4k€, I wasn't that impressed (it's sounded alright, but not amazing). Thing is, at this MSRP Duettos are landing in a tough competition, with actually cheaper Buchardt A500s, that I consider superior, not to mention my actual speakers (A500s Signature Edition) that IMHO are just in another league. By the way, while the A500 SE is sold out, the new Buchardt A10 seems to perform mostly similar, but with less bass extension and SPL.
I would add the Dynaudio Focus 10s to the list, that were demoed at PAVS last year. These really impressed me. Sounded massive, filled the entire room, had smooth highs and very consistent low-end, considering the unique 5.5" woofer in such a small cabinet. Sure, it costs 1k€ more, but I'm sure you can negotiate for less. And, no, theses are not "just" Evoke 10 (that I'm also familiar with) with an internal amp. The active crossover/DSP is doing an amazing job.
In a lower price point, you also have the Cabasse Rialto, that pleased me both times I heard them. They cost about the same, or a bit pricier than the LS50W2, and they deserve consideration.