Having 2 years experience on the SF1080 and SF830, a year on the DW1400, and three months experience on the KT Atlas 790, I can only say that the KT foil revealed the differences for me.
The SF have incredible low end, but by far not the glide of the KT Atlas. The KT Atlas has both incredible low end and glide, plus it can roll and turn like the SF.
The SF profile wise was never intended for glide. It's just way too thick. Glide is about minimal drag and span.
But in the case of the Atlas, things change. With it's cambered trailing edge, you can have a thin profile (because the camber also adds strength across the span) and less span, overall resulting in minimal drag. That Kane kid is super smart!
The DW1400 tries a similar camber profile philosophy as the Atlas (see pic, the bigger one is the DW) but it camber is much less pronounced..the span is large and the wing is thick (I guess for strenght across the span. The layup is HM carbon.. maybe that was needed for adding strength across the 1400mm)

Some of my results of back to back testing.
1) Turning on the DW1400 has always been mission impossible for me, even with the suitable s142 stab. At the same time taking a large size KT Atlas (980) the thing turned smooth as ever.
2) low end: both DW1400 and KT 980 are identical and allow to get going on 8 knots. The KT was even better because once up it accelerates like a North HA1050!
Seeing the benefits of the cambered profile with less span and thin profile were an eye opener. This realization that here is a new Gen foil, plus the fact that North is hardly putting any info on the DW out there (.. no review videos, Gav did a few seconds on the DW750 in a video...but other than that there is so little info on the DW. Adrien Destang is the only one on IG showing glimpses of the DW.) ....convinced me that I needed that next Gen foil that KT offered.
I think all that's needed from North (if Mike and the crew are reading this) is a bit more video material out there on the DW. All I hear North taking about are the SF and MA. But zero on the DW range.
And for all the hype around the MA, I rode a friend's MA1050 the other day, in direct comparison against the KT.. while the KT felt loose and dreamy, the MA1050 felt heavy, slow, too much on rails. I couldn't wait to get my KT back. That's a pure honest assessment.
And my friend has now (after riding the KT) put his MA1050 plus entire North set up for sale. As he knows now what he wants. He got the taste of this next Gen foil.
Nothing here is to talk bad about North. I created the other thread on the North Sonar with its 200.000+ views!!! And posted 100s of posts in it.
My last hope was the DW830 but it was months out of stock.. super frustrating to be honest. I mean we're post COVID, and you'd expect things to be in stock.
Been loving my North setup for a full two years and a bit, but the lack of new stuff coming out (or lack of useful reviews/info on the DW range).. just nudged me to invest into a new direction.