Perfectionists spend more time cooking, writing or even painting, but what they eventually finish is noticeably better than something created by other Sims. Perfectionists accept nothing shy of perfection.
Sim does most things better than other Sims, but sometimes it just takes a bit longer...
Sim can paint higher quality paintings, prepare higher quality food and write better novels.
It can help Sims become better architects in Ambitions.
Perfectionists can point out the flaws of other Sims in conversation.
Perfectionists always do neat actions automatically, such as making their beds after waking up or cleaning their dirty dishes after eating. For this reason, Perfectionist is like Neat, but with added benefits at the cost of time.