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srtgumbee said..
"got a lot of power and bottom end too"
Have you had Koncepts 2018 or older to compare your 2019 to? I have a 2016 5.4 koncept for my speedboard and looking to add to my quiver this season. It would handy to know if the small speed sizes 4.7,5.2,5.7 of 2019 (and assuming 2020) have more bottom end than older models and also if the top end has remained the same or changed?
I have had pretty much every year Koncept 5.4m and then 2019 Koncept Speed 5.2m (first a Proto and then a Production example) and 5.7m. Also 2015 4.6m and then 20194.7m.

Some changes year to year were subtle in stability and balance, but noticeable. Changes from 2017 to 2018 were a bit more obvious with better bottom end
and top end. We were very happy with that one to say the least.

The changes for 2019 were a bit more radical with again, a slightly deeper lower section and slightly change in the max draft position, reinforced by the 4th bottom batten and some other changes to free up the twist.. After a season+ of speed sailing all 3 small Speed sizes, I found it very hard to suggest improvements on the 4.7m. It is sensational in both bottom end to get going and it's extreme stability in violent 40+ gusts. And, it is really fast and easy handling. The 5.2m and 5.7m were also a quite noticeable improvement on the 2018. The 5.2m has better bottom end than the 2018 5.0m, but at least as good top end range and stability. The 5.7m is somewhere in between the older 5.4m and 5.8m in size. A little closer to the 5.8m, but feels and light as the old 5.4m and for me seems to have at least as good range. The 2020 5.2m and 5.7m have been more closely matched to the shape of the 2019 4.7m. by giving them more depth in the lower section and a bit free'r twist. The 5.7m needed a bit more added than the 5.2m. The changes have lowered the centre of effort for a more stable and powerful feel whilst reaming very light handling.
In the past, my PB speed sails have usually been the 5.0m. (or the 4.4m in the earlier models). Since 2015-5 I have very nearly matched my PB's with the 5.4's, but always felt the 5.8's were better suited to the bigger guys. That changed a bit with the 2019 5.7m Koncept Speed, which for me felt more like the lighter feel of the previous 5.4m, but with a bit more power and drive lower down. It still felt comfortable on my 40cm wide speed board, whereas the 5.8's always felt like they weighed the board down too much for me, although the bigger guys just loved them. I am looking forward to seeing how I go with the 2020 5.7m this year, especially at Lake George. I think it will be my go to sail on those 'not quite 30 knots of wind days' on the CA40 when I have previously loved the 5.4m.

And I think the bigger guys will love it in those 30-35knots + PB days.
Short answer: Yes, better bottom end AND top end, and smoother handling. I know thats what all sailmakers say, but the difference from 2015- to 2019 is very noticeable, in range, handling and speed.

Discalimer: I have had a big hand in testing and developing these sails, and obviously they work for me, but the feedback from other KA speed sailors is extremely consistent with mine.
Hope this helps.