iPhone 5 Call Quality Compared On AT&T, Sprint And Verizon

The iPhone 5 packs in a number of audio related improvements including support for Wideband audio or “HD Voice,” a new noise-cancellation ear piece, three microphones (up from two in the iPhone 4S) and an updated speaker design.
How does this affect the call quality on the three major U.S. carriers AT&T, Sprint and Verizon?
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