Thanks for nice recording.
The diffent shapes of the sopranos matters? Straight, tipped bell, "Saxello", perfect curved (semi curved) and fully curved have differnt voices? Or is it the players that matters? Or a combination between the player and shape of the soprano? A straight soprano have a diffent sound compared to a fully curved. The bell of the curved soprano is more aimed to the players ears so the player is adjusting the tone/sound. Modern mikrophones and PA (monitors/headphones) are good for the soprano.
I have four straigt Bb sopranos; Conn NW c -24, Buescher TT (LP-122 model) c-28, Kohlert modell 1927 and "Schenkelaars" c -52 (Keilwerth, Nauheim stencil), Same, same ... but diffent when it comes to tone/sound.
King Curtis didn't play a King Saxello. He was on a perfect curved Martin, Lyon Haley, Holton, Courtier .... ? In the hand of a good player these bastards sounded pretty good. After perfect curved King Curtis played a straight Selmer.