I know, pardon - I was actually looking at HE-500 v HEX v2 (which I just bought) reviews and ran into yours.
I have heard both of the first two versions of the 560. My 500 was bought in 2012 - so its somewhat early
There are always cases of unit to unit variation. OTOH, the 500 > 560 opinion runs about 80/20 here.
I never meant to indicate HFM would intentionally replace a very popular (actually any) headphone with a lesser one. Doesn't make sense.
The HFM family has attracted my attention like no other manufacturer. I either own or have heard: HE400, HE400i, HE400s, HE500 (now quite modded), HE560, HEX v2, HEK v2, Ananda, HE-6, HE5-LE, Sundara, Shangri-la Jr (sorry HFM, Voce walks all over the S-la jr)
I endorse them all at their price point save the Ananda and 560 - or at least the used price since the HEK list price is rather high.
There are people who love AKG, Beyer, Grado - and that's fine. But Hifiman, I believe is a brand I know very well, and IMO those two models just don't fit the pattern to me, or the two 560's and two Ananda's I heard were both defective in same ways. I had the same thing with the LCD2 2C - bought a used one and borrowed another - and they both sounded the same - not for me. But some people love them.