http://www.liveleak.com/view?i=403_1347969287 :Guys in plate armour frolicking about. Demonstrating mobility while wearing plate. Hobbyist re-creations of 15th century fighting manuals for the moves I guess.
The thing about weight distribution is not about technology, but about how the weight is somewhat more uniformly distributed around your body, rather than having a combat belt (full of magazines, a shovel, water, rations, grenades, anti-armour mines if you're unlucky, LAWs, extra ammunition for the gunner etc...) and a shrapnel jacket that puts all the weight on your shoulders and your waist. And whatever weapon you have is always going to weigh more than any sword or pole arm.