Since it seems the e line has changed the GS1k and PS1k quite a bit I don’t think anyone has heard both of them yet. Comparisons to the older models might not be accurate anymore. e.g.: GS1k has recessed mids but it seems the e series brings them closer to the forefront, like the old PS1k. And then, the new PS1ke is apparently a better, more accurate performer with soundstage and bass response than the older one.
The PS1000’s weight with the default headband can be an issue if you wear them for many hours. But it’s not a huge issue. Just a bit of pressure at the top of the head. the side cushions are fine since they only touch the sides of your head, not your ears. The pressure on the top of the head is relieved by getting a third party headband from turbulent labs or a thicker headphone cover for the existing headband.
The GS1000i/e, as I think you may already know, has zero weight issues. very light and comfortable.
If you do get a chance to hear both the ps1ke and gs1ke as a demo, please come back and tell us