Reviewing the participants and replying to other's opinions Ive drawn up my conclusions.[/B]
1. Wolverine's Superfast regeneration and Adamantium Bones makes him basically undestructible!! Unless Sif has an Adamantium bullet (Like Stryker) or a Superhot Adamantium sword (like Silver Samurai) there is no way Sif can kill him.
2. Wolverine's Adamantium claws can cut through almost any material. Chances are that Sif will get cut down.
3. The OP never stated this was a slugfest or a hand to hand combat therefore K.O. isnt valid. Furthermore, Wolverine enduring punches from the Juggernaut makes K.O. highly unprobable.
With all these said, my conclusion is: