In the meantime here's a shot taken in Keswick at the weekend. Camera handheld, probably f8 and the image straightened a bit in PS, so not really ideal
Actual pixel crops top left and bottom right.
There is just a smidgen of CA on the top left crop, but it's hardly noticeable, and, given the position of the crops within the frame, pretty sharp; certainly sharp enough for what I need. Not bad for a lens that cost me around £25!
Click for a bigger image, both of these are reduced quality JPGs, but fit for purpose methinks. The crops have default Lightroom sharpening applied in raw conversion, but have not been sharpened in PS.
Sony NEX 6 Pentax K 28mm f3.5