I just want to point out that even if Kodak
SLR use K-mount lenses your Pentax auto focus lenses night not work with it.
Sigma uses a modified version of the K-Mount on their bodies.
So with a little time you can adapt any Pentax K-Mount lens to fit. And the screw mount adapter can be used with no mods at all.
However they have built their bodies with the same electronics's as Canon uses.
If you try putting a K-Mount fitting onto the Canon lens it'll stick in too far, where the contacts will all bind not allowing you to twist it on.
Making it almost impossible to use a modified canon lens.
So if you want a fully automatic lens for your Sigma camera your stuck buying it straight from them.
There's nothing stopping Kodak from using the same practices. And I really don't see anything wrong with it.