Quote: but why would you only use pentax glass on a mirrorless? it would be silly to ignore the huge assortment of lenses out there.
Why would I use my Pentax lenses on a Sony E mount camera ? Because I have 20 PK mount lenses and that is why there are many here purchasing APS-C and full frame E mount cameras to use with their PK mount lenses. I also have a 35mm F1.4 Bower Sony A mount , Sony 28-70mm OSS FE mount, Tokina 24-200mm full frame Nikon mount ,Sony 16-50mm E mount and Sony 55-210mm E mount lenses.
Here is my full frame VG900 with Sony 28-70mm FE OSS lens:
Here it is with PK mount 24mm F1.4 :
Here it is with full frame 24-200mm Nikon mount :
Here it is with Sony A mount 35mm F1.4 :