  In the search for a realistic walking technicolor model, QCD with many
flavors is an attractive candidate. From the series of studies by the LatKMI
collaboration, we present updated results of the scaling properties of various
hadron spectra, including the (pseudo)scalar, vector, and baryon channels, for
$N_f=8$ QCD analyzed with the HISQ action. By comparing these with $N_f=12$
QCD, which has properties consistent with conformality, possible signals of
walking dynamics are discussed. We also present a preliminary result of the
flavor-singlet pseudoscalar mass in many-flavor QCD.
