Massive quiescent galaxies at z>1 have been found to have small
physical sizes, hence to be superdense. We search for superdense
massive galaxies in the WIde-field Nearby Galaxy-cluster Survey
(WINGS) of X-ray selected galaxy clusters at 0.04<z<0.07, and in the
ESO Distant Cluster Survey (EDisCS) at 0.4<z<0.9. In both samples we
discover a significant population of compact galaxies, which
approximately represent 22% of all cluster galaxies. We find a
relation between mass, effective radius and luminosity-weighted age in
our cluster galaxies, which can mimic the claimed evolution of the
radius with redshift, if not properly taken into account. We also find
that morphological change, which surely occurs in the hostile cluster
environment, must be properly considered when comparing high- with
low-z samples. By comparing the two cluster samples between each
other, and with spectroscopic high-z surveys, we find that there is
global consistency in the galaxy sizes out to z~2, while a discrepancy
of a factor of 3 exists with the only spectroscopic z>2 study. In
contrast, there is strong evidence for a large evolution in radius for
the most massive galaxies with M*>4x10^11Msol compared to similarly
massive galaxies in WINGS, i.e. the BCGs.