According to gog.com's bestselling games list Cyberpunk 2077 is selling like crazy. It has already sold more copies on gog than games like Saints Row 3, the Hitman series, or Mirror's Edge (and those are all a lot cheaper). The bulk of the games ahead of it have been on gog for ever (number one right now is Heroes of Might and Magic 3).
On steam's top selling list the game is number one, but honestly I have no idea how steam's list works. Is it listing just the current month? It can't seriously mean all-time, right?