You got to use it more.
The 43ltd and 77ltd are the best lenses I have for aps-c studio portraits.
Razor sharp just one stop past wide open.
Relatively good working distance in the house.
43ltd
20120526_IMGP0020_F040_043_FA43Ltd-1 by jenkwang, on Flickr
77ltd
20121222-IMGP2512-1 by jenkwang, on Flickr
Both my kids are too big liao. don't like to be photographed but my son now has his own K5IIs which I upgraded from the K30 Crystal Black I got for him last year.