Is there concordance within the concordance $\Lambda$CDM model?
  We use a complete and rigorous statistical indicator to measure the level of
concordance between cosmological data sets, without relying on the inspection
of the marginal posterior distribution of some selected parameters. We apply
this test to state of the art cosmological data sets, to assess their agreement
within the $\Lambda$CDM model. We find that there is a good level of
concordance between all the experiments with one noticeable exception. There is
substantial evidence of tension between the CMB, temperature and polarization,
measurements of the Planck satellite and the data from the CFHTLenS weak
lensing survey even when applying ultra conservative cuts. These results
robustly point toward the possibility of having unaccounted systematic effects
in the data, an incomplete modelling of the cosmological predictions or hints
toward new physical phenomena.
