I previously claimed that Ultima blades are more difficult to use than similar MK blades, because they require more strength (longer spin rocker radius), and you have to control your motions more precisely because the usable blade length between the sweet spot and the toe pick is shorter.
That info was based on several Ultima runners made years ago, with factory ground edges. It is now out of date, by at least several years.
Ultima no longer sharpens blades at the factory. They add no hollow - sometimes it is slightly convex instead of concave. The factory profile is a lot different from what it was several years ago - for one thing, the toe pick is only slightly above the profile curve.
Virtually all retailers, even mail order companies, add a hollow to Ultima blades, and the good ones try to create a rocker profile that will suit the skater, especially up front.
One way of looking at this is that there no longer is a "standard" Ultima blade shape. Everything depends on the sharpener.
(Riedell doesn't sharpen at the factory either. I'm not sure about Paramount. MK/Wilson does, but many pros think they are more consistent than MK/Wilson, routinely reshape those blades too.)