The traditional French place ? I think not.
My company car is a Peugeot 207. The window buttons are on the door, in front of the handle.
I had a Laguna 2 a few years ago, window buttons were on the door handle as well. Renault Scenic models are the same. The Renault 5 my mother had decades ago was the same. So I would say that the traditional window button position in France is on the interior door handle.
On the other hand, I had a BMW 330d, it had all window button controls behind the gearshift on the central column. I found that quite practical. Curiously, the Audi A5 I have now has the buttons . . on the door handle.
Concerning the DS5, I am quite happy to know that they have removed the Citroën name from it. A Citroën car has hydropneumatic suspension. It is the defining characteristic of Citroën, and the main reason that all Citroën lovers have stuck with the brand.
A car that does not have hydropneumatic suspension does not deserve the Citroën moniker.