[Guest]

A Japanese photographer managed to borrow a pre-production sample:

http://thisistanaka.blog66.fc2.com/entry/1153/

http://thisistanaka.blog66.fc2.com/entry/1154/

http://thisistanaka.blog66.fc2.com/entry/1155/

http://thisistanaka.blog66.fc2.com/entry/1156/

 

Sorry, it's in Japanese and all the images taken are small size (due to the 'beta' status of the lens).

 

This should be a well corrected lens (unsurprisingly, given its size) capable of maintaining good characteristics for all focusing distances. Good bokeh (I guess... the image is too small), excellent flare resistance even by Pentax standards (??). Recommending the use of the central focus point(s) - the f/2.8 ones I suppose - but focus accuracy assessments would wait for the final product.

Build quality? They put 7 screws on the lens mount just to make sure there will be no play whatsoever.