In terms of historic accuracy. A knight would be able to absolutely kick a viking and samurais ass. for a knight to be able to even move in their armor they had to be in peak condition.

Therefore in a contest of strength agility, combat in general, the knight would be victorious

True. A Vikings' light chainmail armor would be no match for a knights heavy plate and chainmail type armor, as well as a knights sword. Even worse if the knight has a warhammer or war axe.

This is one of those images where you scroll past it and then scroll back because you weren't sure exactly what it was

Why is the knight using a folding chair??

Because.