This season Hamilton is chasing a record-equalling seventh World title while Bottas is after his first.
"This is my eighth year driving for Mercedes, and the buzz is the same", added Hamilton of the team that has won the past six drivers' and constructors' championships.
After winning 15 of the 21 races in 2019 and with a major regulation changes due in 2021, its clear Mercedes has continued with a similar concept with the W11, although technical director James Allison said some significant changes have been made to open up more development potential later in the year. "We've created more face area - so more actual radiator area in the vehicle - which is a hard thing to do mid-season without incurring quite a lot of penalty. It could be easy for them to be laid back today but they aren't".
"I think everyone gets excited, everyone seems refreshed, revamped and ready for the challenges ahead".
Either way we won't have to wait long to see this fancy lid on the track with pre-season testing set to get underway at the Circuit de Barcelona-Catalunya on Wednesday, February 19.
"I think at this time of the year you don't feel any pressure, it is just about having some fun".
"The guys have worked so far to put the vehicle together. It is a real privilege to have that position".
As for whether he's feeling any pressure ahead of his quest to equal Michael Schumacher's record, he isn't, at least for now.
Meanwhile Max Verstappen, who could be one of Hamilton's closest challengers, had a run in the Red Bull vehicle for the upcoming season during a filming day at Silverstone on Wednesday. He is definitely one of the best out there, but he's not God. "Maybe God is with him, but he is not God". "I tend to see that as a sign of weakness".
"It is pretty incredible, and we get to stretch its wings today".
Contrary to a year ago, when Mercedes rolled out a quasi new-spec auto after one week of pre-season testing, the Brackley squad will likely head to Melbourne with relatively few changes to the W11's original specs.
"At the front we have accepted more structural complexity around the uprights and wheel rims in order to provide a higher performance assembly overall".
The Mercedes is expected to be the vehicle to beat again, especially after its strong performance previous year, when Red Bull and Ferrari could only manage three wins each out of 21 races.
Also on Friday, Alfa Romeo are giving a first test to their new auto at Ferrari's Fiorano test track. But their two rivals are hopeful of taking the fight to them.
And the former Toro Rosso team, who are being rebranded as Alpha Tauri this year, will unveil their vehicle in Austria on Friday evening.