Besting another BA CIEM is not good enough. It has to pretty much best or equal headphones to warrant the price.
It does not, it comes resonably close though in terms of bass in general and highs in timbre and in decay. However, other IEMs (RE-400, TWFK) also come close enough, closer in some ways. (e.g. RE-400 in mids timbre, distortion and general blending, TWFK in general balance if deep fitted)
SE-5 loses out a lot on portability (it's not pocketable) and looks. (uhm, huge cyborg hearing aid) It really wins out on isolation of course, but that's rarely required in a not-really-portable form - perhaps for recording monitoring while playing, which is quite rarely for me and closed-back headphones like Paradox hold their own well enough.
(and they're way better without equalization for starters, despite also being a bit dark due to being non-diffuse-field equalized - but it's not a shelf, it's a slope.)
So unless you're an actual gig musician in a stupid places that cause deafness, I'd pass on this specific CIEM.
(or better still, strong-arm the manager to not be an idiot if you have enough chutzpah)
I'd probably be better off with UE IERM or UM Miracle in the grand scheme of things. CIEMs are so much hassle, getting properly done impressions, sending them back and forth for tuneups and replacements... I've done that two times (impressions three times) already and I say enough.