Is it what it's call Sibilance ?
Not always, but with some record.
I just got ps1000 today and I have listened to them for about an hour now.(I got my ps1000 2nd hand and maybe about 200 hrs on them).
From my memory , Gs1000 soundstage is wider and maybe slightly more details.
PS1000 mid is thicker and more forward and has more upper bass .No sibilance on PS1000 at all which is nice.They sound very smooth.
I feel GS1000 is better at low volume listenning, more speaker like sounding than the PS1000.
But if you ask me which one I like better, its PS1000!!