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This is the third of a series of papers on three-loop computation ofrenormalization constants for Lattice QCD. Our main point of interest areresults for the regularization defined by Iwasaki gauge action and n_f=4 Wilsonfermions. Our results for quark bilinears renormalized according to the RI'-MOMscheme can be compared to non-perturbative results. The latter are availablefor Twisted Mass QCD: being defined in the chiral limit, renormalizationconstants must be the same. We also address more general problems. Inparticular, we discuss a few methodological issues connected to summing theperturbative series such as the effectiveness of Boosted Perturbation Theoryand the disentanglement of irrelevant and finite volume contributions.Discussing these issues we consider ont only the new results of this paper, butalso those for the regularization defined by tree-level Symanzik improved gaugeaction and n_f=2 Wilson fermions, which we presented in a recent paper of ours.We finally comment to which extent the techniques we put at work in the NSPTcontext can provide a fresher look into the lattice version of the RI'-MOMscheme.

High-loop perturbative renormalization constants for Lattice QCD (III): three-loop quark currents for Iwasaki gauge action and n_f=4 Wilson fermions