Germany's Chancellor Merkel said she would listen to David Cameron's ideas on Europe but said there would have to be compromise.
France's foreign minister was more critical.
Europe editor James Mates travelled between the two key capitals to gauge the responses:
To the surprise of many Lib Dems, Nick Clegg appears to have played down the importance of the Coalition's divide on an in-out referendum.
Business leaders in Davos are worried about the Prime Minister's pledge to put Britain's membership of the European Union to a referendum.
With some in France keen to "roll out the red carpet" for a British exit, Germans favouring decentralisation welcome EU renegotiation talks.