I've owned Paradigm Atom and Studio (20 and 60) speakers. Can't comment and the Sig series. I think the Atoms are one of the best value speakers in their class.
The Studio series, IMO, does everything well, better suited for HT but also very good for rock music. What they lack, IMO, is a "wow" factor. Rarely a moment, in my experience, where a certain instrument, vocal, track produces a sound that makes you want to hear that again. Really no soulful or emotional connection - at least musically.