I own a K5 and a number of K, M and A lenses along with a number of FA and DA lenses. That said, and leveraging off of the questions that Joe posed, I would have the following observations.
Your current Pentax lenses are A you indicated. So you are going to be focusing manually. One of the large difference between the K-01 and the other Pentax bodies is focusing. The K-01 has focus peaking, and the others have a viewfinder or live view - however no focus peaking. With my K5 at times, I do find manual focusing a challenge, and possibly focus peaking would be helpful. That, or go to a split focus screen to help with the manual lenses. My old Spotmatic IIa with the split focusing screen is a joy for manual use - well over the K5 when manual lenses are involved. Having said all of that, close in focusing with a large aperture - i.e., a thin depth of field, hand held, is difficult, since you can easily move very slightly and change where the focus is.
I am going to assume that you are probably going to be doing some close in focus work - if not down right macro. That means that you are going to have to probably stop down in order to increase your depth of field. Do you usually operate in bright sun or deep in the shadows? Planning on using a tripod or possibly boost the ISO? The K-01 has ISO 100 with the K5 having ISO 80 and a great dynamic range to pull detail out of the shadows. However, using a low ISO, with good dynamic range, a moderate aperture in low light, wanting the best IA, you will be on a tripod with just about any camera.
I think that you could do well with the K-01. However, in saying that - its contingent on how you plan to use the body.....