I just came off of a Cinelli Starlight w/Columbus Muscle carbon fork made from Columbus Starship tubing. This was a very fast, light and responsive bike unfortunately I was in a pretty bad crash two weeks ago and busted the frame. I've replaced it with an Orbea Orca all carbon frame. To my surprise this bike has a stiffer BB than my Cinelli and delivers it without the harsh ride that alluminum bikes generally have. The Orbea Zuess fork isn't as stiff as the Muscle but overall the all Carbon bike is very stiff but dampens better than my the Starship tubed Cinelli.

I've ridden Looks and Times and the Look Kg 381 seemed a little flexy to me while the Time was rock solid (but they are $3k+) and felt more "metal" like to me.
BTW I am 5'10" weight 165#. I think bigger ridders might not find carbon to their liking but this is just a guess on my part.