Thanks Greg and I will check out the Sony. One thing I did see on the web that differs from you experience was a test on the new iPhone 7 dongle.
Measurements show it to be inferior to the headphone jack only iPhone 6+
“The results are clear: with an iPhone 6S, the dynamic range worsens by 4.5 dB(A) for 24-bit music files. For the iPad Air, it worsens by 3.8 dB(A). The signal also gets worse for 16-bit music files, even if they aren’t that drastic: the dynamic range worsens by 1.8 dB(A) and 3.1 dB(A) for the iPhone and iPad, respectively."
http://bgr.com/2016/09/20/iphone-7-headphones-jack-sound-test/
Measurements show it to be inferior to the headphone jack only iPhone 6+
“The results are clear: with an iPhone 6S, the dynamic range worsens by 4.5 dB(A) for 24-bit music files. For the iPad Air, it worsens by 3.8 dB(A). The signal also gets worse for 16-bit music files, even if they aren’t that drastic: the dynamic range worsens by 1.8 dB(A) and 3.1 dB(A) for the iPhone and iPad, respectively."
http://bgr.com/2016/09/20/iphone-7-headphones-jack-sound-test/