Vettel and teammate Kimi Raikkonen had been unable to challenge Hamilton in Melbourne qualifying, both finishing nearly seven-tenths of a second off the defending champion.
The Silver Arrows now lead both the drivers and constructors championships after six races. Williams is now bottom of the constructors standings with just four points, all scored by Stroll in Azerbaijan.
Hamilton is looking to equal Michael Schumacher's record of seven Canadian Grand Prix wins.
"Naturally I am still here to win but as I said if they've got upgrades on their engines which can be a tenth to two tenths - Ferrari are particularly very strong on the straights, it will be interesting to see whether we're able to match them or not".
Last year, Esteban Ocon and Sergio Perez kick-started their rivalry in Montreal as the lack of a Force India team order potentially cost Ocon a first F1 podium, nevertheless, their cars always feature near or at the top in the speed trap which is a good stat to lead at this track.
"For me, this is a very exciting race".
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The VA system structure is now based on the way medical services were provided from the 1960s to the 1980s, he said. There was no counterpart over in the Senate which helps explain why it was rolled into the current bill.
"It was a little bit frustrating, but it doesn't seem too dramatic" of a problem, Ricciardo said. Teammate Sainz put the back end of his auto into the wall early in the afternoon and managed just nine laps. Sauber's Marcus Ericsson also had a spin that left him facing the wrong way on the track, but he straightened out and resumed.
Southern Ontario last hosted the Grand Prix in 1977, when Bowmanville Ontario's Mosport Park was the site for the F1 auto race. This season he is the only driver to not have been beaten by his colleague in qualifying sessions.
Mercedes will come to the Canadian Grand Prix as favorites with the team having dominated the last few of seasons.
The Formula One team, which took to Twitter on Tuesday to announce "We are ready for Montréal", posted a video of Toronto's skyline with Montreal's name superimposed.
The race takes place Sunday in Montreal.
"There are tracks where each driver has strengths and weaknesses", Hamilton said.