I just came across this article, the new Pentax 500/5,6 available in december 2012.
As a canon 400/5,6 user i was really excited, until i saw the price (6999,95 us dollar).
Well 6999,95 is still cheeper than 10-12K for Canons 500/600 f4.0 (800/5,6), but i don't
think any won will jump to Pentax just cause of this.
It's still nice to see that Pentax is committed and delivering new and exciting products.

http://www.dpreview.com/news/2012/09...AW-for-K-mount