  We consider the impact of the recent data obtained by the LHC, Tevatron, and
fixed-target experiments on the nucleon quark distributions with a particular
focus on disentangling different quark species. An improved determination of
the poorly known strange sea distribution is obtained due to including data
from the neutrino-induced deep-inelastic scattering experiments NOMAD and
CHORUS. The impact of the associated (W + c) production data by CMS and ATLAS
on the strange sea determination is also studied and a comparison with earlier
results based on the collider data is discussed. Finally, the recent LHC and
Tevatron data on the charged lepton asymmetry are compared to the NNLO ABM
predictions and the potential of this input in improving the non-strange sea
distributions is evaluated.
