While Finland lost, the difficulty the Soviets encountered during their offensive was noted by the powers at the time. It was another factor convincing the Nazis that invading the Soviet Union wasn’t as terrible and idea as the balance of resources and forces would suggest.
Historians still debate whether the Soviets intended to conquer all of Finland at the onset of the war. While the eventual peace treaty left Finland ceding more territory than the initial Soviet ultimatum demanded, Finland retained its sovereignty, which was incredible given the disparity in military power and the existence of a puppet Finnish communist government.
I think this is from Berserk, but it’s been years and I can’t quite tell.