  We present a detailed next-to-leading order (NLO) leading twist QCD analysis
of deeply virtual Compton scattering (DVCS) observables, for several different
input scenarios, in the MS-bar scheme. We discuss the size of the NLO effects
and the behavior of the observables in skewedness $\zeta$, momentum transfer,
$t$, and photon virtuality, $q^2=-Q^2$. We present results on the amplitude
level for unpolarized and longitudinally polarized lepton probes, and
unpolarized and longitudinally polarized proton targets. We make predictions
for various asymmetries and for the DVCS cross section and compare with the
available data.
