I haven't watched KP2 yet, but I saw the first one the other day with my nephew. I gotta say...
They do a really good job with those fight scenes. That entire scene with Po and Master Shifu fighting over the meatbun is really impressive, not to mention the Furious Five versus Tai Lung. They really put a lot of effort in the fight scenes, and I love that. Did the sequel get a similar quality in fight scenes?
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EDIT: I stand corrected. Lucy Liu IS doing something... She's voicing Viper in the Kung Fu Panda TV series.