Originally posted by UncleVanya ? I'm confused about what you are saying. It is still as wide or wider depending on if you crop. Even cropped to exactly apsc it is the same angle of coverage as before. A full frame 22-23mm is going to be about the same angle of coverage (with more pixels) as the 15 and if you manually crop it could be slightly wider. Cropped will of course only give ~16mp images.
So I conducted a test for you today. Apologies for the image quality. I had to shoot at 22 f-stop on both cameras because my k-30 has aperture block failure.
I didn’t touch the photos at all in LR, so they’re bland, as RAW files are.
First pic is k-1
Second is k-30
Hard to tell because I had trouble screwing the camera onto the tripod in the same place. You could be right. I assumed that with in body vignette correction it would be less wide