The Exynos version uses a different DAC compared to the Snapdragon version. According to SamMobile's app, it's a "Lucky CS47L91 Sound" chip, like the S7.
From experience, the best I can say is that it delivers good sound, but don't expect HTC 10-level audio quality, let alone that of an LG V10 and Axon 7. However, it's definitely better than that of the Snapdragon version, which uses the built-in DAC on the 820, which is known for being functional, but nothing special.
I'm not entirely sure who makes the DAC, as some say it's Wolfson while others say it's Cirrus Logic. Cirrus Logic acquired Wolfson in 2014, so either would be likely.