No, a saber has a "infinite" cutting ability but the denser the object the harder it is to cut. To slice thru a person require a lot of heft. This is best seen when Anakin kills the sandpeople and when Dooku gives Obi two flesh wounds with a light hit and a stab. Otherwise even something like dropping the saber on the ground would cause the saber blade sink right into the ground. Yes, this isn't done every well most of the time but this effect has gotten better in the PT.
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