An article on artist Vienna Teng in The Seattle Times from March 5, 2004 includes a comparison to Tori and Vienna's reaction to that. Vienna recently released her excellent second album called Warm Strangers.
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You can read the entire article at seattletimes.nwsource.com. Here is the Tori part of the article/interview:
Tori is one comparison Teng gets often, Sarah McLachlan another. A San Jose Mercury News writer said her music sounds "like a child of Chopin and Sarah McLachlan."
"The comparisons keep coming up, I can't complain," Teng says. "Tori and Sarah comparisons I get a lot, but I think it's fair because I listened to them a lot in college." While she's been lumped in with Dido and Jewel, she politely says, "I do appreciate comparisons to more literate and less pop-oriented singers. ... I'm more flattered to be compared to folk singers than pop singers."