A DFA*50 F1.4 Hands-on, with Full Sample Photos

http://www.kennychi.com/lens-pentax-dfa-%e2%98%85-50mm-f1-4-sdm-aw-%e8%a9%95%e6%b8%ac/
(in Traditional Chinese)

With quite some samples, full original JPEGs available with EXIF at the linked Flickr. Some purple/green fringing can be seen at wide apertures, anyway.

Yet Another K-1 VS M2 IQ Comparison (Youtube)

https://youtu.be/JQKu972nvU8

I blog, you decide.

DPR has Re-shot Studio Scene

https://www.dpreview.com/articles/1423988259/letter-from-the-reviews-editor-pentax-k-1-mark-ii-studio-scene-re-shoot

Conclusion remains unchanged.