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The european broadsword was mad for hacking your opponent down to the ground followed by piercing thru the armor and chainmail by putting all of your (and your armor's) weight on the blade. The Katana is a sword made for cutting and thrusting. So even if the samurai's thechique were superior( I wouldn't call it superior but rather different since the difference of use and purpose) he would probably be beaten down if he received a blow of the heavier sword with his lighter armor. the Knight could withstand the slashes and thrusts better because of his heavier armor. Altough I don't like the tough of that
Maybe there are some more experienced people that can tell if there are some technique's (maybe some koryu) that is based on fighting heavy armor?

some of the better vids/documentary's on this topic:
-http://www.youtube.com/watch?v=qpEC38sL3iU
-http://www.youtube.com/watch?v=5Hy_A9vjp_s&feature=related (part2)
-http://www.youtube.com/watch?v=fxYvwEnKRjA&feature=related
-http://www.imdb.com/video/wab/vi3009871897/ (reclaiming the sword)

I especially recommend the last one!