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Recent studies of AGN data from deep X-ray surveys suggest that signatures of reprocessing of the intrinsic X-ray continuum in the circumnuclear environment grow weaker with increasing luminosity comma redshift comma and line-of-sight column density. Selecting two bright and hard sources from a wide and deep X-ray survey comma we propose to directly measure the strength of reprocessing signatures in individual high-luminosity AGN. Leveraging detailed studies of their lower-luminosity local counterparts comma we will directly and independently test the reported trends. The proposed joint XMM-Newton and NuSTAR observations offer a unique opportunity to advance studies of the obscuring circumnuclear material in AGN outside of the local Universe.