I've never heard the s6, but I did get to audition the s10 against the Paradigm Studio 100 v.3 side by side with the same gear. To my ears the Paradigm was neutral while the s10 was very detailed by comparison, but some of you may call this bright. Too me bright means "ouch" while detailed or foward means the highs are extended without beign fatiguing and I can listen at high volumes without getting that headache I've gotten after listening to some speakers. I now own the s10 and find them to be very detailed, but never fatiguing.
I compared the MA S6 vs studio 100 v2 and to my ears on the same gear, the MA's tweeter was a lot smoother than the digms, without any lack in detail. Overall the presentation of both was very different and I preferred MA's. It seemed as if there was better transition between the highs/mid/lows. On the digms, the highs and lows attracted a little bit my attention, like a little emphasis, or separation... On the MA's everything seemed better integraded...
If anything, the S6 were less bright than the studio 100. But bright might not be the right term, little less metallic/sibilant.... Maybe more refined... less harsh