There are way too many full frame lenses around to answer you specifically about each and everyone. Generalizing, the FA* and Limited lenses are of excellent build quality. Many F and FA lenses are, too. And then some are too plasticy, like the FA 28-90.
From own experience I consider the FA 20/2.8, FA 50/1.4 and FA 135/2.8 well constructed, and the FA 100/2.8 Macro is built as a tank. Their F counterparts are probably equally good. The F 70-210/4-5.6 is a solid lens as well.
You may want to check the lens review database where some reviews mention build quality.
Pentax Lens Review Database - Main Index