While S8f/p is an upgrade for what you have although Sony XB50AP indicates that you might like good DD bass (I owned XB90 in the past). S8 will not give you that. Also, S8p is Harman tuned, fun sounding (assuming S8F even more so), while Roland IMO has closer to Difused Field kind of tuning which departs far from anything I heard before except for Etymotics er4s (minus brightness and 7K peak that er4s are known for). Roland sounds very realistic and and everything else sounds V-shaped in comparison. Edit: It looks to me that S8P is Fearless best attempt of Harman-esk response, while Roland, i guess, is DF with rolled of treble. Most likely it's tuned by someone with good ears at Fearless Audio, regardless of the common comp. curves, just to get realistic natural sound. Roland sounds remarkably good with all sources including FiiO BTR3. With Roland I find myself less compelled to switch to my DAP or external DAC as it it steamrolls through any possible LDAC compression artifacts without exacerbating them and doesn't bother me at all. (Note: I'm one of those few who moved from Spotify to Google play & Tidal because Spotifys OGG Vorbis compression artifacts were messing up high hats for me, couldn't bear it anymore). With Roland - between Galaxy8+ 3.5mm out and multiple LDAC BTs - need for my Hiby R6 diminished greatly - so no rush with a DAP. Cannot comment on Phantoms but Roland, besides mentioned above, also sounds good with many terrible mastered 90's and early 2000's Pop recordings, chews right trough some busy Rammstein live recordings, my friends wanted me to hear (normally I cannot tolerate that kind of music for more than a minute) Roland is amazingly forgiving and it does not come at the expense of treble details.