A retest of the Pentax 55-300 would be great.
Also the Tamron 17-50 2,8 non VC would be the perfect reference lens as it was tested on all systems.
http://www.opticallimits.com/pentax/618-pentax70f24?start=1
ePHOTOzine also has tested the DA 70 on a K-5:
http://www.ephotozine.com/article/smc-pentax-da-70mm-f-2-4-limited-lens-review-16835
Furthermore, here are results of the FA 77 on a K-5:
http://www.ephotozine.com/article/smc-pentax-fa-77mm-f-1-8-limited-lens-16892
As a comparison, the tests of photozone on a K10D
http://www.opticallimits.com/pentax/127-pentax-smc-da-70mm-f24-limited-review--test-report?start=1
http://www.opticallimits.com/pentax/128-pentax-smc-fa-77mm-f18-limited-review--test-report?start=1
Could you comment on the different findings (MTF50 graphs: DA70 vs. FA77)?
