No, I don't believe so. The Great Patriotic War (the Eastern Front between Russia and Germany) alone was more devastating than all of World War I. In Stalingrad, for example, armies fought and lost thousands of casualties over many days of fighting simply to gain a single structure in the city. The Russian Army, millions of peasant conscripts were shoved into patched leather scraps they called "uniforms" every other soldier was given an ancient (as in 19th century) Mosin Nagaunt rifle, and given a direction to storm. It was the duty of soldiers without rifles to follow a soldier with a rifle for the express purpose of picking up the rifle when (yes when, for it was barely an "if") the soldier dies. Russia alone lost over 23 million men, women, and children between Stalingrad and Berlin (think about that...that's the ENTIRE population of New York city...three times over, completely obliterated) They (as well as western Europe) was under supplied, underfed, and (literally) shot at when they tried to retreat or take cover instead of marching forward in a great wave.
World War II was more hardcore. World War I had generals, presidents, kings, and soldiers marching into war as if it were a glorious affair. World War II had men like Hitler...Stalin...Mussolini, regimes of totalitarian conquest and fear with the literal aim of world domination....and they were very close to achieving their goals.