What I'm actually amazed by is how many here are underestimating Sebastian after 2017 & 2018. Vettel dominated the sport in superior machinery the way Hamilton has been these last few years.
But that's the way it is in F1 these days I guess. Short memories. In 2010-12, Sebastian was the GOAT winning anything & everything, Alonso was lauded as a great "dragging that Ferrari into places it didn't belong", and Lewis Hamilton was handily being beaten by Jenson Button.
Today somehow Hamilton is the GOAT, Alonso forgotten & Vettel is just there to get beaten. 
Leclerc seems like a very talented youngster and he will come good. But these expectations from race 1 are insane.