trevinthefionaapplefan
100+ Head-Fier
I've no direct experience with the S8, but I can tell you the US V30 measures ruler flat. (If you search back through this thread you'll find the FR curves.) I'd be surprised if the S8 doesn't also measure totally flat. I'm not doubting you hear a difference, but the overwhelming reason for those differences has to come from the combination of headphone and output impedance of the S8. There's nothing wrong with that if that's the sound you prefer, but there is no aspect of the S8 audio that's technically superior to that of the V30.
Technically, the s8 is likely inferior, yes. But it is more rhythmic and enjoyable to me.