Hi Richard. I have owned and extensively paddled a Swordfish (vac glass) and I currently own a Swordfish S (carbon hybrid). It won't surprise you to hear that they are very similar since the S is just an evolution of what was widely regarded as a good design.
I find the Swordfish to be a secure and supremely comfortable fit but I find the Swordfish S to be quite uncomfortable and loose. I've had to pad the cockpit out which I don't like having to do. FWIW I'm 175cm & 75kg.
I think the Swordfish S might be a tiny bit more stable but there is not much in it. The Swordfish S does catch runners noticeably easier than the original. Probably because of the cockpit having been moved forward. The lack of a leash attachment in the original is a PITA.
I have paddled the Hawx 43 briefly but not back to back with the Swordfish / S. This is a nice boat. I found it to be more comfortable than the Swordy and more stable than I expected. I don't think however I would be as confident in downwind conditions as I am in the Swordy (although it must be said that I still use a more stable boat in big downwinders).
Current boats
Epic V10L Ultra, Epic V9 Ultra, Carbonology Sport Boost X LV, Fenn Bluefin, Nelo 510, Fenn XT double, Nelo 600, Expedition Kayaks Azure, Mirage 732.
Previous boats
Spirit PRS, Fenn Swordfish, Fenn XT, Fenn Swordfish S, Think Zen, Epic V10L Club, Carbonology Sport Boost LV