I tried some of the Volkls at a retail demo last spring, including the AX4. It takes me several days to evaluate a ski so with only two runs, I honestly could not tell the difference - I owned the G4 last season. I have an email from Volkl that says the ski is unchanged but I think it is softer based on Keelty and others who tried it. I send emails to ski companies but their replies are very general and not reliable.
All brands of midfats keep getting softer: Volkl, Bandits, Intuitives, Big Stix, Beasts, etc. One might argue that they are apealing to a wider range of abilities or one might argue that with new technology the performance does not require such a stiff ski. I don't know.