does it need to be gun vs gun in self defense laws in canada? or i can shoot a knife weilding man in canada for self defense?

It used to be 'equal force' - gun vs gun, as you call it. But that's changed. You're entitled to use whatever force is reasonably necessary to defend yourself from the reasonable apprehension of death or grievous bodily injury: If someone is coming at you with a knife, and you reasonably anticipate that you'll be killed or suffer grievous injury, and there's no lesser way of preventing that risk, then yes, shooting him would be acceptable.

Of course, you might still have to answer some difficult questions as to why you had a loaded firearm on hand...

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