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Me neither - I've got a white one for a walk around and a black one for use with my DA*300 set up.
Dave

There is a very big consensus on this now. All we need now is a definitive solution!

There are now 3 reviews on the "other" site and they are amazing. Two 9's and a 10 and faster focusing than the DA* 300 and sharper with the TC (allegedly of course"
Found this odd though:-
"...keeper rate rate is much higher with this lens then with the da*300 (+tc) and it feels like you have a higher buffer/burst rate. High iso looks cleaner as well comparing it with the da*300+tc"
Why? Surely these are camera/sensor issues not lenses?
Dave

Yes - spotted that. Great little drama as well!
Dave

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That's a shame. I think the majority of birding and wildlife Pentax users will look at this and ask themselves two questions. Compared to the DA*300+ 1.4x TC how fast does it focus at 420mm and how does the image quality compare.
Dave

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I have to agree with John . The lenses you speak of, even at f4 are exceptionally expensive and very, very heavy. As a wildlife photographer myself I feel the trend, even with the Canon boys, is for something more practical and versatile. With the advent of better high iso images the need for a very fast lenses is not as great as 5 years ago, especially with full frame becoming available. Add to that the additional cropping potential in recent years and the extra sharpness without the anti-alias filter I can't see many Pentax users wanting to spend the price of a new small car on a lens. It is a shame that the new Sigma's and the cheaper Tamron 150-600mm in particular weren't made in a Pentax mount. However if the Pentax 150-450 lens turns out to be as good as John thinks it is then the only gap for birders may lie with focusing speed and tracking capabilities (and that may be closing) rather than focal length.
Dave

John, if you have the DA*300 how do you feel the focus speed and lock on compare with that, with and without the converter in each case?
Dave

Thank you John.

Bump: Reduced to £235+ £10 p+p. This is for a brand new one remember!
Dave

I am a dedicated Pentaxian but enough is enough! You cannot track a fairly slow flying bird against a blank sky with reliability. If you point it at the bird it will likely miss it first time then you have to look up to see where it is to get it back in the frame. You can do it - and I have got better at it but I have missed the moment so many times compared to my Canon mate standing next to me. You can be successful but if you lose focus it is difficult to get back. I have decided to find out for myself if there really is a big difference or if it is a case of the "grass is always greener" or my technique is rubbish. To that end I have bought a Nikon D5300 body and am able to borrow a Sigma 50-500mm to test it with which I am hopeful will be similar to my Sigma 150-500 on my K3 to compare - so watch this space.
Dave