Polys: 1,151,620 (without antialiasing 147,863)
Verts: 605,545 (without smoothing 156,832)

Turbosmooth modifier (1 iteration) is open.
The sofa and cushions are made with the correct layout.

Arflex Marechiaro System Sofa
H: 71cm (28"), L: 361cm (142.1"), D: 248cm (97.6")
https://www.monologuelondon.com/products/marechiaro-system-sofa 

Version CoronaRenderer 10.
In CoronaRenderer 6 and below, CoronaLegacyMtl is CoronaMtl.
CoronaLegacyMtl requires Corona Renderer version 1.5 or higher, as it takes PBR into account.