I know that many of us have already read many articles on mic'ing pianos. This article provides some interesting insights into the types of mics, including the U87 that is modelled in Pianoteq, and also provides a brief list of the piano mics used by some people who may be of interest, such as Diana Krall's producer, Al Schmitt:
http://www.soundonsound.com/techniques/piano-recording
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