There are two types of luggage: Rimowa and Not Rimowa.
Carry on and checked Rimowas fare quite differently.
From what I see at the baggage carousel there are 2 kinds of Rimowas
Dented aluminum Rimowas.
Broken polycarbonate Rimowas.
I don't see any real global brand changeover in the checked baggage realm.
I see regional trends and there were a lot in Hong Kong, not so many in Amsterdam.
What I am noticing is the latest generation of soft luggage gaining ground on all the hard side carry ons.
Companies like Red Oxx and Tom Bihns bag/ backpack convertibles hold more and seem to work better as carry on.
Uncle Dave