A speaker preference is personal. Having heard both, I’d personally go with the SF. The Harbeth is not “a much better speaker” - it is a different speaker and they both have their strengths. FWIW, I own neither right now but the SF O3 is on my list, along with the Serafina’s, KEF Ref 5s, and Vienna Acoustics. I’ve got some room challenges that I’m taking into consideration. I’ve listened to Harbeth a number of times compared to other speakers and while yes, they have a nice midrange and pretty sweet treble, they weren’t the most satisfying to me at their price range. I will also say this - I have to live with and look at a speaker as part of my living space as I don’t have a dedicated room. In that regard, the Harbeth’s are at a very serious disadvantage to SF.
