Problem with comparing carbon with steel in terms of toughness is that carbon composites are non uniform in their structure (nor is steel but let not delve into that kettle of fish). I would also assume carbon bikes vary a great deal in their design and how well their manufactured, composites have come on leaps and bounds of late... but i'd still have my money on steel in terms of strength for any odd impacts..
Problem with comparing carbon with steel in terms of toughness is that carbon composites are non uniform in their structure (nor is steel but let not delve into that kettle of fish). I would also assume carbon bikes vary a great deal in their design and how well their manufactured, composites have come on leaps and bounds of late... but i'd still have my money on steel in terms of strength for any odd impacts..