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The current study used a psychiatric sample (N = 69) to examine: (1) the correspondence between self- and other-reports of general personality, as measured by the Five-Factor Model (FFM; Costa for the PD traits agreement ranged from .37 (avoidant) to .69 (antisocial). At both the domain and facet level, the personality profiles reflected in the correlations between the FFM scores and PD criteria were consistent across raters with the exception of narcissistic PD. Substantial evidence was found for the incremental validity of other-rated personality scores, with these ratings accounting for an additional 8 to 20% of the overall variance in PD features. The other-rated FFM scores also accounted for more variance in consensus ratings of impairment in the domains of romance, work, and social relations.
Miller et al. (2005) studied this question.