Damn ninjas.
I was going to be nitpicky but the question you asked could be interpreted on a more broad way, i.e. "are there any P2P clients with a collection of music similar to what What.cd has?" So I removed that from my post.
Then the thread shifted to how great RuTracker is (and it is awesome). To answer your current question, I'm too lazy to do number crunching and compare both, but RuTracker's music selection is huge, and ratio-keeping very easy.
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