I have several Selmer soprano mouthpieces, most of which are good players.
In Super Session, I have two E's and two J's (I used to have three SS-J's but gifted one to Bruce Brennan ["olhonker"], an SOTW member).
In S-80, I have several ranging from C* to J (including two G's, two J's, and three E's), and one scroll-shank Soloist-style C*.
Among the S-80's, most play well, but among the three S-80 E's, one is fine, the other two are notably inferior. AND, the S-80 D was unplayable. So, I sent the S-80 D to Joe Giardullo at SopranoPlanet and he worked his magic on the S-80 D. Wow, does it play good now. I rank it among my best, if not THE best Selmer soprano mouthpieces.
My three Super Session J's were so similar I could not decide which one was best. And for the most part, I've had similar experiences with Selmer's other soprano pieces. So while I've experienced some inconsistencies among various Selmer soprano mouthpieces, they have been more consistent than inconsistent.
In MY experience with them, I've found the S-80 C* to be more powerful than the scroll-shank C*. Oh, the scroll-shank is a fine mouthpiece, it is just that for me, I like the S-80 version better. Others may have the opposite experience. In comparing the Super Session E to the S-80 E, and the Super Session J to the S-80 J, it is a toss-up for me. They both (Super Session and S-80) have their strong points - different yet comparable. It is just one of those things - maybe the chosen reed is what separates them but even that changes when the reed changes. DAVE