Mercedes boss Toto Wolff hailed his squad after it claimed back-to-back Constructors' championships at the Russian Grand Prix.
Mercedes claimed victory through Lewis Hamilton and opened up an unassailable 172 point lead over nearest rival Ferrari.
Wolff nonetheless accepted the day was bittersweet after early leader Nico Rosberg was forced to retire with a throttle problem.
"That was a day with every possible emotion: a bittersweet day on track, then a tense wait - and finally a confirmation that we have won a second world championship," he said.
"But what a feeling it is to win a second title and a privilege to be part of this team. A world championship isn't just about points on a scoreboard, it's about many hours of hard work and sacrifice from every single member of the team, most of whom are away from the limelight and work with incredible dedication six or seven days a week."
Wolff says that despite Mercedes' title triumph, it must make progress to avoid reliability gremlins.
"I'm gutted for Nico after a problem with his throttle mechanism forced him to retire," he explained.
"It shows how sport this cruel can be: he had a brilliant weekend and opening lap, and I can only take my hat off to him about how he handled the situation, both in the car trying to find a solution - and afterwards in his professionalism.
"It's another reminder to us that, even with the steps forward we have taken on reliability this year, our work is never done and we need to keep focusing on every tiny detail."