barcelona , bayern munich , juventus and real madrid make up last four .
real madrid looking for their 11th title and to retain their crown .
barcelona have won three champions leagues since 2006 .
the two spanish giants have never met in the champions league final .
their meetings this season have resulted in one win apiece .
who will win the champions league ? our reporters have their say .
cristiano ronaldo , lionel messi and luiz adriano battle to be top scorer .