Originally Posted by hitherandthither
I demo'd both at Sugarloaf in December and skied both in Val d'Isere. Given that it wasn't really tough in December -- a fair amount of snow and not too icy -- I liked both skis. But really the 8800s/Mythic Riders are a big radius powder ski. I wouldn't object if I had to ski on them but I can't see why you would choose them over the 8000s. (I bought a pair of Legend 4800s for East coast purposes but haven't used them yet!)
I own both MRs and L8Ks and I am puzzled by your characteristic of the Mythic as a big-radius pow ski, my does not really feel that at all (both my L8K and MR are 178 cm). True, Mythic is much more of a GS-feeling ski and is much more stable at speed than L8K, but at the same time it is surprisingly quick turning for a 88mm ski. L8K is nimbler, and will hold the edge on ice somewhat better, although it is still not quite comparable to a dedicated carver. The achilles heel of the L8K is crud, they get deflected a bit too easily, while Mythic slices through crud effortlessly.
I ski in the West and Mythic now became my everyday ski over a pair of L8Ks and a dedicated powder boards. Last winter I actually took the L8K's to the East Coast to ski for a couple of days in New England. I loved them on the groomed- a lot of fun, even at stupid speed, but whenever I tried to get into the frozen crud off-trail, they immediately gave up on me.
So if you venture off-trail in the east often, my guess that the burlier Mythic will be a better ski, even though it is less turny. Otherwise go with the L8Ks, it is a terrific ski if you know its limitations. 178 seems to be the sweet spot for both models, 172 is also recommended.
P.S. Disclaimer: my L8K is one of the earlier models with 20m sidecut, not the current model's 19m.