Williams Martini Racing revealed the first look of its 2018 Formula One challenger car, the Williams Mercedes FW41, at the team's season launch in London.
Despite Vettel leading the title chase for the first half of the Formula One championship, it was Hamilton who eventually took his fourth drivers' championship title.
Raikkonen currently sits fifth in the driver's standings heading into this weekend's season-ending Abu Dhabi Grand Prix.
The "Paradise Papers" revealed that Hamilton was given a refund of more than $4 million after his Bombardier Challenger 605 was imported to the Isle of Man in 2013.
From 2021, teams will still use the 1.6 Litre, V6 Turbo Hybrid, but - crucially - it will be run at 3,000 rpm higher to increase noise.
Hamilton's 2017 title ties him with Vettel and Alain Prost as four-time winners while Manuel Fangio won five and Schumacher's seven championships still tower over the sport.
Hamilton won his fourth career championship Sunday with his ninth-place finish at the Mexican Grand Prix
Anticipating a rowdy Mexico City reception, the Force India drivers insist they came to the race on good terms.
Hamilton, however, did not hesitate to admit that he "loves" drivers being able to participate in other series away from F1.
Despite Ferrari's status as Formula One's richest and most popular team, it hasn't won a driver's championship since Kimi Raikkonen in 2007.
Hamilton tightened his control on the F1 season title by winning the U.S. Grand Prix on Sunday ahead of title rival Sebastian Vettel, who finished second.
A win in Suzuka would move Hamilton a step closer to a third F1 title in four years with Mercedes and his fourth overall.
Mercedes is 118 points clear of Ferrari and close to sealing a fourth straight constructors' championship
Having seen both of its cars fail to score points at the previous race in Singapore, Ferrari lost Kimi Raikkonen moments before this race.
Hamilton secured the 70th pole of his career in qualifying, and his fourth straight in Malaysia, while Vettel failed to set a time because of an engine problem.
Vettel, meanwhile, was handed a 20-place grid penalty after Ferrari made several component changes to his engine before the race.
Max Verstappen qualified third ahead of Red Bull teammate Daniel Ricciardo, while Hamilton's teammate Valtteri Bottas was fifth.
It was a reversal of Friday's second practice when Vettel was quickest ahead of Raikkonen.