In no way is Jade similar in tonality to K1000, R10, W5000 and SA5000 . It is a bit similar to HE60. I did not hear other headphones on your list but I heard above enough to form an opinion. I also think O2 is very neutral, if a bit warm sounding, and I use T1S amp with them. O2 is also is nothing like HD650 and HD600, tonally or otherwise. Oh and get over it you have old fast ears.