Very true. If you or anyone want to know what the HD560s kind of sounds like, you can become a patreon of "Oluv's gadgets". He makes the most accurate sound demos and released one for the HD560s yesterday. Or you can wait a few more days until he publishes the video for everyone.
From the demo I can say it sounds definitely more open than the HD58X but also A LOT brighter! It is actually on the verge of being piercing to my ears. Though it sounds more complete in general.
That's great news! Looking forward to him releasing that video very much. I have the HD58X, which are great, but a bit bassy and a tad uncomfortable at times (I wear them for several hours at end and think they might contribute to my headaches with their ghastly clamp). The 600s are too expensive for me and I don't want to get rid of subbass completely, so the 560S seem like a good option. The better comfort would be great. However, having had the 770s for a while I'm concerned about treble sharpness - that would be a definite deal-breaker for me.
Oluv is the one youtube reviewer I trust, especially since he demonstrates the actual sound and doesn't use audiophile terms to describe it.