  We analyze the possibility of the leptonic mixing matrix having a Wolfenstein
form at the Grand Unified Theory scale. The renormalization group evolution of
masses and mixing angles from the high scale to electroweak scale, in certain
new physics scenarios, can significantly alter the form of the leptonic mixing
matrix. In the past it was shown that such significant enhancement implies that
the leptonic mixing matrix at high scale can be the same or similar in
structure to the quark one. We thoroughly analyze this hypothesis in the light
of the latest neutrino oscillation data as well as other constraints such as
those coming from neutrinoless double beta decay. We show that such an ansatz,
at least within the context of minimal supersymmetric models, is no longer
compatible with the latest experimental data.
