I find the O2 Mk1 to have a deeper headstage than Jade, and the Jade have a wider headstage than O2 Mk1. In that sense I thought the Jade were closer to the O2 Mk2. The HE-5 headstage is deeper than jade but not as deep as O2 Mk1, and the headstage is wider than the O2 Mk1 but not as wide as the Jade.
I really enjoy all of them, and in comparing the HE-5 to HP-1000 with Equinox cable on my ZDT the HE-5 were clearly better to me in all areas, and closer to the Stats or HD800 in performance. (HP-1000, HE-5, O2 and Jade do beat the HD800 in the area of bass, but not in the out of head soundstage you get with HD800.)