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, Fenn Bluefin, Nelo 600, 550, 520 & 510, 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, Carbonology Sport Boost X LV, Fenn XT double.