The new Pentax K-01 directly competes with the Sony NEX series, which are considered among the best mirrorless cameras at the moment.
If you are considering getting a mirrorless camera, take a look at this.
Same sensor as the Pentax K-5 which will guarantee you incredible low light performance, 6 FPS and it uses the K-Mount. Every single Pentax lens is at your disposal. This is the ONLY brand doing this, the other brands all make you buy new, proprietary lenses.
Pentax are so clever.