Caveat lector: I work on Mercurial a lot.
The sets of features are quite similar, particularly with core features. There are a few differences in things you can do with non-core commands, but nothing terribly significant.
The bigger difference between the two is in how the user interfaces "feel". This doesn't affect the functionality of either system, but I think that Mercurial has a more complete, consistent command line UI than git, and certainly one that's more familiar to CVS or SVN users.
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