Do you have references to those tests? My personal experience says otherwise. I have steel, aluminum, titanium road bikes of about the same pedigree and setups. The different materials absolutely provide a different ride. But, if I'm thrown on some random, unfamiliar bike and ride it for a short period of time, I probably couldn't guess the frame material.

I have a Scandium bike too with an oversized bottom bracket. Being 200lbs, on a climb, I can definitely feel the difference the bottom bracket makes. All the other bikes flex a little when I stand up and crank. Not the Scandium bike. Maybe that's unimportant to you, but I really enjoy the feeling of stomping on the pedals and having the bike immediately respond to the power.