The comparisons can't come soon enough. It's been a while since something that's both exciting and affordable came out, so I am glad the 560S came around.
Also, regarding the post above; HiFiMAN and Sennheiser have a very different house sound, both in terms of energy and spaciousness. Comparing the 4xx/5xx HFM range and the 5xx/6xx SENN ranges is not exactly fair, as the former were always more spacious and energetic, while the latter goes for s more relaxed and intimate experience.
If the 560S is a bit different in this regard, it might make the comparison to HFM's offerings more even. Personally to me, aside from the 400S and HEX (and barring the newest, priciest stuff HFM made, like the Susvara and HEKSE which I have not heard), I've always found HFM erring on the thinner, more analytical sound, with a well extended, but somewhat soft bass response and crystal clear, somewhat aggressive treble. This is the signature HFM house sound.
I am trying to find a headphone that'll best match the sound of my reference speakers which are devoid of artificially inflated, detail magnifying treble. I currently own the Verums which I find very good for the price and fairly balanced, if a bit soft in the bass and treble regions, but nonetheless closer to my preferred reference sound. So I am excited to see how the 560S might compare to some of the well-established, consciously priced offerings from Senn, AKG, Beyer, Phillips, Dan Clark and yes, HFM too.
It is looking very promising so far so that's good to hear!