Don’t agree... i believe every high-end brand has specific sound characteristics that make them different being all other peripherals constant..
Well, I hate to give you the bad news, but there is no clear house sound for SF. I tried a few models at my home, heard two others at dealers and one at an owner's home looking to sell his, all in fairly impressive setups, and there was no consistent "sound" among them.
If you want consistency, go listen to B&W, Magnepan, Vandersteen, Thiel, Sound Lab, to name a few,
I have had the SF Amati Futura for two+ years now, driving them with top-tier mono amps, and I would not classify them as warm at all. The rendition of vocals and piano is superb, but I would not claim this is because of an over-emphasis in the lower mids. The overall tonal coherency is impressive with the top 2 octaves being what I would call, polite. The smaller Olympica model had great detail on top but no tonal coherency through the middle to lower-mid octaves.
Oh, and if you really want to hear a brand that gets constant praise, but which has little consistency of a "house sound" across models, go listen to the Audio Research line.
Again, this is why I suggested you ask about models. But since you state this is not required, then the responses here will be as I stated before, the usual, "blah blah blah.
