Yes, I had S8F a while back they were fun exiting in the beginning, coming from $200 iems, they sounded like a big upgrade but eventually realized V shaped tuning is not my thing. S8P was supposedly better with mids so switched to Pro (I believe Fearless didn’t do anything with mids in particular here but tuned down the bass and treble a bit from F) after hearing LZ A7 which had much better mid presence and less peak even just with the stock black nozzle, I sold the S8P and happily downgraded to A7. With 10 tuning options it’s the best iem to play around if you want to find your ideal sound signature.
My impressions about S8F is from my memory and very subjective but I clearly remember it was fatiguing with my library (old school thrash/death/black) the production quality didn’t help paired with an analytical V sounding iem. My sound preference also changed from bright neutral to warm neutral in over an years period but that said EJ07M is not warm iem, treble is energetic but smooth, there no fatigue or peak. You get the details here without elevated treble. Mids are not at all recessed and that’s the highlight for me with the EJ. Meanwhile S8F was extremely detailed to a point it felt very unnatural with elevated treble which didn’t suit my library and the mids suffered, guitars sounded thin. EJ on the other hand is extremely different with mids, guitars sound forward in the mix and heavy AF. I am listening to good old Abhorrence - Completely Vulgar compilation record atm, it’s not the not the cleanest production but more raw and real sounding. Guitars tone is freaking heavy, it sounds not polished but just as is when plugged into an amp, very dirty (if you grew up listening to a lotta 90s death metal like me you’d appreciate the raw sounding guitars, instruments sounded like instruments) I am able to appreciate all the instruments in the mix here, that rumbling bass guitar following the guitar sounds really good. Keep in mind, production here is not the highlight infact it’s usual 90s sound but I am able to appreciate it much better with EJ07M compared to S8F. I believe the OG EJ07 follow the diffuse field target, while updated EJ07M has slightly more elevated mid bass and treble more air.
S8F might have a slight edge in bass speed being a BA ( I wish I could A/B them) it was lightning fast I remember but EJ definitely has the better bass, that DD punches hard but Mest might be more punchy? I haven’t tried Mest Mk2 but from what I hear they are bass heavy. I am not a bass head, EJ07M gives me more than enough bass, anything beyond this could be too much for my taste and affect my listening experience. Drum strikes are more natural in comparison with S8F. For a tribrid coherency is really good. Better timbre defenitely goes to EJ. Soundstage wise I am not sure which one is better but EJ is exceptional with imaging.
Comfort wise, EJ07M is smaller in shell size even for a tribrid so I pick EJ over S8F. With that very energetic tuning and bigger shells I couldn’t use S8F for longer listening sessions.
FYI recently there was a collab btw HBB and Shuoer, there’s a new EJ07M Kinda lava edition which just got released with more mid bass and lower mids.