The K-01 has newer CDAF than the K-5, with the primary advantage of being able to specify the focus area more precisely. Computing is also a bit faster. We performed a direct comparison here:
Pentax K-01 Review - Autofocus Performance | PentaxForums.com Reviews
CDAF tech has been continually improved since then, however, and you can definitely tell the difference between the current models and older ones like the K-01 and K-5. The biggest improvement is the faster focus motor which can be found in the K-3 and newer- it can make focusing with screwdrive lenses much, much faster, especially in CDAF.
Adam
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