If anyone is wondering what I think of the 3 headphones. The Sundara do behave slightly different to the AKG but I couldn't describe what, this is probably just the difference in driver types. I felt the Sundara had something extra compared to the AKG, some instruments sounded a bit louder than others, but on the AKG they sounded uniform. In a few cases this made the Sundaras better, having something extra in places can help a song, but the other times it felt like something was wrong and it isn't supposed to be like that. If I consider the AKG as a perfectly neutral baseline, the Sundara feel like they included more detail in some parts, and the DT 770 were lacking detail in some parts. On average, the Sundara sound better for a few songs, but the AKG are better in general as refrence headphones.