Just a quick hit review, but I finally skied the MX88 back to back: old vs. new model. Not what I expected! It was beat up, heavy crud, challenging conditions for sure, 32-degree wind affected snow.
The old MX88's were 178cm, original model, had around 8 days on them. Friend dropped them off for a tune and let me borrow them for the day. New MX88's were fresh out of the wrapper, 178cm as well.
Just a couple of runs on each before the weather turned and they shut the lifts down. These skis are close in character, but not the same! I really felt the old MX88 was a bit beefier: it had an uncanny stability when really opening things up. I even remember this from early 2008 when I first skied it: hasn't changed over the years. Seemed a bit stiffer underfoot. The new MX88, in contrast, was more nimble, with even more of a sweet spot. Maybe 97% of the old model's stability, but the tip felt softer: more engaging, more active, easier to get bend up and maneuver through cruddy big bumps forming. More forgiving with very little loss in performance. Tail release was similar, and there was no way to check on edge hold: snow was soft and heavy.
Long story short: I liked the new ski better; it seems even more versatile. MX88's tip was similar in flex and feel to the current FX94: the previous generation's was a little beefier. Old model had slightly more "charger" feel, the new one just is easier, really with no significant loss in performance.
It seems they took what they learned with the MX88 update and applied it to the current FX94, at least in terms of flex. Checking on flex in both skis, they are nearly identical at the tip and underfoot.