Both the 1967 Lee Marvin flick, Point Blank, and Mel Gibson's Payback (1999) are based on the novel, The Hunter, by Richard Stark (Donald E. Westlake). Although the underlying premise is similar, the two movie adaptations are significantly dissimilar to each other.
I'd like to know which of the two scripts is, if at all, more faithful to the novel. Please also consider Helgeland's 2006 director's cut of Payback (titled Payback: Straight Up) which is quite different from the original.