I'd probably go for Proxima Nova A to get the circular /G.

Thanks for the hint !

This is indeed a similar font, though it is not quite identical. Should I understand from this that the font used in the logo is probably custom made, as I suspected ?

Where do you see the differences? Because to me, at this size, I can't see any and believe me, that's probably very hard to match this /S. The other option I could see is Gotham but it has no circular /G even as alternative (that's actually why I suggested Proxima Nova instead of Gotham).

Proxima Nova is indeed real close

Thanks a lot !

Now looking at better sample, I think now it's Gotham with a custom /G (underneath text positively set in it), Proxima Nova remaining the best ready-to-go option with a circular /G.