[davidmanze]

Do you want me to test it ? 

If you buy it for 90% after testing ... sure. :-)

Other than that the weight is just prohibitive for such a focal length/aperture prime.

I'm afraid that it is not available in the Pentax mount, I just thought that maybe you would comment on the Otus's  performance as you were the first to bring the lens to our attention and that also it is claimed to be the best standard lens available!