Yes, the DA series lenses are designed for digital and very small. These are primes lenses.
Generally speaking, Pentax lenses are small with 49mm filter diameter being common across most of its prime lenses (others generally use 52mm or larger).
Too bad the Kr sample images are not out yet on imaging resource. But it is know to be better/similar/close to the older model Kx.
Sample images JPEG at ISO3200
Kx : http://www.imaging-resource.com/PROD...XINBI03200.HTM
A33 : http://www.imaging-resource.com/PROD...3INBI03200.HTM
A55/33 series does very aggressive NR at high ISO for its JPEG. This results in a loss of detail that can be seen at the hair, eye lash, texture on the collar.