I think it's fair to say that as the AXE has gotten noticeably better, some of the older fanboys have calmed down.
IF the Helix sounded every bit as good as the KPA I'd still keep the KPA for it's ability to add new amps from users. I like such an open and extended capability. But no competitor will ever come close with tone matching EQ crap. That ship sailed a few Ozone's ago.
I do think that Helix will beat the AX8 for just the reasons mentioned, it's in the stores to be seen and played with, but also because it's a much better thought out floorboard. Also, the Helix will probably be supported by Line6 longer than the FXII is by Fractal. You could do an archeological dig concerning Fractal products at this point and put some in museums as far as that company cares to serve their first customers.
Different story with Kemper entirely. Which is why I support Kemper with a passion, aside of it being the best amp tone available, hands down.
BTW, did I read something about Ingolf being a "freak"? Must be 'cause he's so Chic!
(which modeler can do this the best?: