  We compare the numerical predictions for heavy quark production in high
energy hadron collisions in the conventional QCD parton model and the
k_T-factorization approach (semihard theory). The total production cross
sections, one-particle rapidity and p_T distributions as well as several
two-particle correlations are considered. Some of them can help to estimate QCD
scale. The differense in the predictions of the two approaches is not very
large, while the shapes of the distributions are sometimes different.
