Originally Posted by Luke Hobson

You've hit one of, if not the main point there. They are made from the same material, (ally and CF) but how the CF is constructed differs massively between manufactures. It's easy for one of these new companies to go out and just measure all the Geometry from a car. But if the construction of the CF isn't right then you might aswell piss into the wind.
That's an area of testing that the big companies (yokomo, xray, tamiya, HB) have tested and invested in.

That's probably the prominent design that will give each car it's own characteristic for handling.