Thanks for the replies everybody.
I'm coming from the GRD4 which is 28mm, so that is the only focal length that I've been using.
As far as focus peaking and AF: for street photography I love the snap focus feature on the GRD4 so I need lenses with zonefocusing abilities.
I like versatility and the 28mm, so I will go with the DA21ltd first.
Still getting the hang of the K01, probably having to do with getting used to the DA40XS. I'm used to the wider angle.
And of course, I need to improve my skills!
Here is a link to the my flickr stream where you can see some of my first published pictures taken with the K01 and others taken with the GRD4.
Flickr: perptual3's Photostream