K-30 mid-size SLR
Dpreview must have a very strange way of deciding on camera body sizes. It says that K-30 is a mid-size SLR, while Canon T4i is a compact SLR even though it is bigger than the Pentax in every dimension.
It is 133 x 100 x 79 mm (T4i) vs 130 x 97 x 71 mm (K-30).
Well, the 5D3 is also classed as "mid-size" at 152 x 116 x 76 mm so the K30 is in good company.
First camera 1953, first Pentax 1985, first DSLR 2006