I directly A/B'd the SA-5000 and K701 one night and found the SA-5000 had more detail, but that was back when I was a detail freak looking for ultimate note speed, violin friction, cymbal decay, imaging seperation, etc.
The K701 was really wet and smooth in the mids, it lacked bass but might have been the vintage amplifier I was using at the time.
I think the SA-5000 possibly conducts some sub-bass via bone conduction (via the leather pads) which will not show up in an FR graph, so it's under-represented.
Either way, a little ironic it's receiving praise now, it must be the charm of discontinuation? The Sony MDR-EX700 and MDR-E888 have been discontinued too, FTR, most likely due to Thailand factory flooding, and less than ideal demand.