While I do agree up to a certain point, having raced plenty on a steel hard tail, as well as mid level road carbon, and later moving to higher end carbon frames in both disciplines - the difference is there, marginal or more, but it’s there (be it due to frame material, geo, aero, etc) if we’re comparing race rigs level.
But that’s my personal opinion, per what I felt.
Worst case - I’ll sell it 
And thanks for confirming!