As these are both objects with hard edges to them unlike people, it has worked, try it with a person and you'll see how it loses all the fine detail to the subjects extremities, like hair or jumpers.Just tried the stage light mono effect on some objects and they turned out quite good in my opinion. See sample below.
[doublepost=1506856852][/doublepost]Another one (had to reduce resolution because of the upload limit here). No weird contours, looks really fine.