Merak, there are not many steel disc frames under 2kg bare frame weight, irrespective of price. Its a strength issue not a weight thing.
“So, the Soul uses oversize sections in similar wall thickness to any other steel XC frame. What does that get you? Huge strength and longevity for a similar weight to other frames out there. But lets put that into context for a moment. To get the same strength, stiffness and fatigue resistance as the Soul out of a frame made from regular cromoly, it would be nearly 0.5lb heavier than the Soul due to thicker tube walls.”
Blurb from cotic site, so basically you dont need the same strength on a road/cx as the Soul, so no net weight difference really.