First impressions of PS500e (F-pads) relative to SR80 (F-pads), more microdetail and more blackground, an increased sense of depth. Bass is cleaner with improved macro and microdynamics. These impressions are from iPhone dongle.
Warning: perception of technical qualities can be effected by frequency response and first impressions are not very well reliable.
Tonally, Im getting the sense it has at least as much bass as SR80. Deep bass of SR80 was apparent but distortion I felt was a weakness, around HD650 level. PS500e bass distortion seems to be much improved, more microdetail and microdynamics, easier to hear subtle higher harmonics.
Tonally and technically, I get the sense that guitars are a little more crunchy with PS500e. SR80 a little more edgy in treble, PS500e tone and resolution allows less grain.
Another warning: my schitty ears, memory, perspective, and communication.
The nyczaj parts do make the headphone look more expensive as a whole.