Kohli vs Ponting in ODI's is a totally valid comparison.
In tests, although Kohli's failure in England reminds me of Ponting's struggles in India, he has some way to go to be compared to Ponting. Ponting averaged 60 after 107 tests while Kohli is struggling to maintain a test avg of 45! Even though their test stats after 40 tests are eerily similar, it is unlikely that he'll peak like Ponting. In tests, Ponting almost always came good when his team was in trouble.
In tests, although Kohli's failure in England reminds me of Ponting's struggles in India, he has some way to go to be compared to Ponting. Ponting averaged 60 after 107 tests while Kohli is struggling to maintain a test avg of 45! Even though their test stats after 40 tests are eerily similar, it is unlikely that he'll peak like Ponting. In tests, Ponting almost always came good when his team was in trouble.