Softgrey, i am friends with KCD so i may be able to help from what i know...
press... left side of runway
magazines....
editor in chief, fashion director, and fashion editor(s) front row but maximum of 4 per publication. contributing editors second row.
foreign magazines... editori in chief and fashion director only for invitations. front row only if publication is 'top' publication otherwise second row
stylists... stylists who are also fashion editors of 'top' magazines... front row, otherwise second row and so on.. celebrity stylists front row and generally accompanied by one of their celeb clients/friend as rule
photographers... 'top' photographers always front row, photographers who are friends with the PR company not front row, sometimes even standing
celebrities... always front row except at couture where they can be as far back as 3rd row!
buyers... right hand side of runway
major department store buyers: front row, assistants/anything else from same store, second and so on...
general store stockists national... front row
regional...second
small time buyers... second/third
at prada standing only