What is parameterized $Om(z)$ diagnostics telling us in light of recent
  observations?
  In this paper, we propose a new parametrization of $Om(z)$ diagnostics and
show how the most recent and significantly improved observations concerning the
$H(z)$ and SN Ia measurements can be used to probe the consistency or tension
between $\Lambda$CDM model and observations. Our results demonstrates that
$H_0$ plays a very important role in the consistency test of $\Lambda$CDM with
the $H(z)$ data. Adopting the Hubble constant priors from \textit{Planck} 2013
and Riess (2016), one finds a considerable tension between the current $H(z)$
data and $\Lambda$CDM model and confirms the conclusions obtained previously by
the others. However, with the Hubble constant prior taken from WMAP9, the
discrepancy between $H(z)$ data and $\Lambda$CDM disappears, i.e., the current
$H(z)$ observations still support the cosmological constant scenario. This
conclusion is also supported by the results derived from the JLA SNe Ia sample.
The best-fit Hubble constant from the combination of $H(z)$+JLA
($H_0=68.81^{+1.50}_{-1.49}$ km/s/Mpc) is well consistent with the results
derived both by Planck 2013 and WMAP9, which is significantly different from
the recent local measurement by Riess (2016).
