since the PT has more leather and because of its east west shape. It definitely has more slouch than a GH city. A GH city does slouch though. I've seen them and they took look tdf but I think the PT slouches faster because its not a square as the GH cities which are more structured in comparison.
A very broken in PT does look gorge though and I've seen one that was used for 1 year solid, a vert gazon pt with ggh and it looked so slouchy and just different. The leather changed too. It got thicker and very matte. Like an old bbag actually. Same for a sandstone ggh city that my gf owns. Its her only gh bbg so its the main bag she uses and I've seen it from new looking all box like, to transforming now to extremly stretched thicker handles, the leather glaze disappears and the leather!! Again, it looks like an older leather bbag now, just with ggh on it. Thick smooshy. Almost like an 05 leather. I was so shocked (and pleased) to know that gh's will end up like that but they MUST be used constantly for that to happen.
Not sure if I answered your question though. lol!! The giant pt once broken in does shrink (like the gh work does) to looking somewhat like an oversized gh city. I saw somewhat because the city is still very compact when compared to the pt.