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I have too been looking into this as well, and also value audio quality greatly. Although I don't yet have the MMI CarPlay or the EVO retrofit, based on my research it appears that there are 2 ways to get audio from the MMI CarPlay box to the speakers, 1) via AUX input and 2) via Bluetooth from the CarPlay box (newer firmware required) to the car's head-unit.
Via AUX input sound is bad.
Via Bluetooth sound is equivalent of factory installed head-unit audio quality. Multiple people have said that, including those with B&O speakers.
I don't recall reading any comparison of MMI CarPlay sound via Bluetooth vs via EVO retrofit. But all I've read points to MMI CarPlay via Bluetooth being the simpler option without sacrificing audio quality.
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