DA*300 in comparison to the Nikkor AF-S 300 F4

Hi everyone

I would like to hear your experienced opinion on the optical performance of these 2 lenses. I have checked the results for them over at Photozone. The lens providing the better optical performance will be the deciding factor in my decision of which system to go with. All other limiting factors relating to these 2 beauties I can overcome, but optical performance is key for me

http://www.photozone.de/nikon--nikkor-aps-c-lens-tests/228-nikkor-af-s-300mm-f4d-if-ed-review--test-report?start=1

http://www.photozone.de/pentax/643-pentax300f4?start=1

I am not sure how to compare these as not all parameters appear to be the same.

Perhaps some of you have used both and can comment on the optical performances?

Thanks

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http://www.peterbyrnephotography.me