The Pentax K-01 is a bit of an odd duck. It's a mirrorless camera that's as big as digital SLRs, which sort of defeats the purpose of being mirrorless in the first place. Photo quality is among the best out there, but other cameras offer better AF performance and more compact/usable designs.
Photographers who want a camera that'll garner attention and take great photos, who don't mind its size and below average performance.
People who take photos of moving subjects, or who want the main benefit of a mirrorless camera: a compact body.
DCRP Review: Pentax K-01
By: Jeff Keller, Digital Camera Resource Page (May 6, 2012)
The Pentax K-01 is a bulky yet stylish camera that offers excellent image quality when paired with a quality lens. The size and ergonomics are certainly not for everyone, and the autofocus is way too slow for action shooters. If you've got a collection of K-mount lenses and want a full-featured camera for still lifes and landscapes, then the K-01 is well worth looking at. If you're taking...
Pentax K-01 review
By: Mike Lowe, What Digital Camera (Apr 20, 2012)
The Pentax K-01 isn't like anything else on the market. Its unusual exterior may appeal to design aficionados associated with the world of Marc Newson and other designers, but for most average camera users it's too bulky and, on account of its small grip alone, won't appeal to hardened photographers.