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Generally a good categorization of the powers. What makes it so hard to compare is the vastly different geographical sizes, resources and socio-economic situations of the different powers. Russia for example, is much poorer per capita wise than Germany and Japan (though the population difference isn't as big), but it commands a VAST continent sized territory that stretches from Europe to the Far East, that alone allows it to wield much more power than Germany and Japan. In addition, Russia still fields the world's second most powerful military (though China may surpass them in 10 years), so I think Russia should be a step ahead of Germany and Japan (two countries that punch above their weight, but are limited due to their small landmass).
India too is hard to quantify. It certainly has advancement in a field of industries, and it is a huge and massive country with a population over a billion and a large territory. However, it is vastly underdeveloped in so many ways, and still far from it's potential. It's hard to say that a country like South Korea is more "powerful" than India though it's Per capita strengths are so much ahead, but it is so tiny in comparison. So again, this is a challenging list to generate.
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