In many comic storylines, Hela is depicted as a powerful foe, but Thor often holds his own and can match or surpass her strength depending on the circumstances.
It's kind of a mixed bag. Some aspects of Thor's character and story in Ragnarok are true to the comics, but there are also significant changes and creative liberties taken.
The movie Thor: Ragnarok draws its roots from the Marvel Thor comics. It weaves together elements from different comic issues to bring the story to the big screen. The comic influence is evident in the characters, settings, and overall plot of the movie.
In many cases, Thor eventually regains Mjolnir. However, the circumstances and challenges he faces to do so vary greatly from one comic series to another.
Thor lost Mjolnir in the comics because of various reasons. It could be a powerful villain's curse, or a moment of doubt within Thor himself that broke the bond with the hammer. Sometimes, external circumstances beyond his control also played a role.