Yesterday, Pentax gave me a replacement of my 21L that I was having BF problems with. The one they gave me was the one given to "Reposes Photo" magazine in France to use for their review..I guess it would be perfect in that case. None the less I can now use my focal length of preference without hesitation or concern. It is Soooo sharp..I love it.

I'm glad that the problem's been resolved well....happy shooting.