Pentax's K-5 DSLR has been around for a little while now, but it's only just recently received enough reviews to establish something of a critical consensus. The short of it is that the camera largely addresses most of the criticisms leveled at the K-7 it's replacing -- namely, lackluster image quality and poor high ISO performance in particular -- but those improvements come at a fairly hefty cost. The K-7 costs about $300 more than the Nikon D7000, which Digital Photography Review notes has has a similar sensor but a "significantly more versatile AF system." P