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chasm54, I was relatively late to the carbon game and bought my first one in 2003. All of my road racing bikes have been carbon since 2006. I built up my 1990 Stowe Triad (full Columbus SL) a couple of years ago with newer (10-speed) components. I only rode steel road race bikes -- no touring bikes -- and I was always comfortable on them. After riding the Stowe a few times, I couldn't believe how harsh it was compared to any road bike that I'm using now. Had no desire to ride the Stowe again. Stripped it to build a road bike for my wife and sold the frame (finally) just before Christmas.
Moral of my story: Most any reputable carbon road race frame will ride more comfortably than any "classic" steel road race frame. (Not sure what that means for your purchasing decision but the thread title is shooting the...)
Haven't heard any of the newbies in my club complain about a harsh riding carbon frame like I used to hear in the steel bike era.
To me, fit and front end geometry are probably the most important factors in selecting a bike for someone. Have fun shopping.