So my 21 is going back to the seller
even though the shape of the lens wasn't as good as I expected, it still took great pictures. I had traded a 16-45 (plus cash) for it and the seller is sending me back the 16-45. He says the 16-45 is sharp when taking pictures in landscape but decentered when taking pictures in portrait (even though the wobble isn't bad, or so I thought...)
I liked the 21 a lot but I think I'll keep the 16-45 for now... at 21 - for my uses - it was very sharp edge to edge and the copy I had/will have again is especially strong at 45mm. f4 and f3.2 isn't all that different to be honest, and the 16-45 might even be a bit sharper and have better color wide open. I couldn't compare the 16-45 directly to the 21 but I think that stopped down the 21 has an edge over the zoom - as you would expect. At 35 though, I ran landscape tests between the DA 35 2.4 and the 16-45 (both at f5.6) and I was amazed that they were completely identical in color rendering and sharpnes, other than the zoom needing 1/3 stop more light in the form of a slightly slower shutter speed at the same aperture.
I'm sure I'll get another 21 at some point... especially now that you can find them in good condition for under 200, like I saw a couple days ago here in the marketplace!
I still have a bunch of 21 pictures to process (and I'm taking a few more before I send it back) so I'll post more to the thread, I'm sure
Here's one wide open. I'm not crazy about the bokeh on this one.