Israel, oddly enough, comes out as a winner cuz WW2 and the Holocaust did more to ensure the creation of the State of Israel than anything else.
Not 100% clear on whether it was a direct result of WW2, but the UK and France diminished rapidly following WW2.
The USSR comes out with a lovely empire of Communist nations in Eastern Europe, so initially they come out doing quite well for themselves. The eventual collapse of Communism in Europe has very little to do with WW2.
I don't know about Germany. Was the land they lost and the extended period of division into East and West not a pretty lousy outcome? True that their economy came out great, but its a give and take.
"It is well that war is so terrible, else we should grow too fond of it."
- General Robert E. Lee
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"It takes a big man to admit when he's wrong. I am NOT a big man." -Chevy Chase