Thanks!
Forgot to post some statistics:
-about 40million real polygons plus render instances
-over 250 lights(spherical, ies, and mesh light plus a physical sun/sky for the day light views)
-large use of Vray Fur coupled with Vray Hair material for the carpet. The area was quite large (about 250 square meters of carpet) but I've managed to limit the RAM consumption by using the dedicated level of detail feature
-I've used C4D R26, Vray6, Marvelous Designer, all modeled by me except for some laser scans and a couple accessories
-most textures and shaders created from scratch for this project, I've also used a few metal from my bundle
-tone mapping and post production done 99.9% inside the frame buffer, just some highlights compression, a LUT, and some cryptomatte mask here and there, some white balance when needed
-10 days of work including render time
-about 4/5h per image @4K resolution on an old 8core system with 32GB RAM