Originally posted by raider Sorry guys...maybe the question is too general.
For a specific suggestion (which may or may not resonate with you),
based on my recent experience,
I would recommend the Tamron 17-50/2.8 A16P.
Despite its potential for superb image quality,
this lens has a mixed reputation among DSLR users,
because of the difficulty of getting it focused accurately with PDAF.
If you try to correct for FF/BF, it may be hard to find a correction
that works for all focal lengths and subject distances.
With the excellent CDAF on the K-01, these problems disappear,
and the lens performs to a uniformly high standard.
The Tamron is now my go-to lens on the K-01
for any unknown situation where a single prime may not work.