Just my 2 cents. I own DA 21 and DA 70. Never really wanted a DA 40, to me this is really THE least exciting limited due to immense array of options in the field of 35-55 mm lenses. Although I love portraiture, DA 70 does not really satisfy me in this field and I find myself reaching for Pancolar 80/1.8, K50/1.2 or even F50/1.4 more often (mostly due to CA in bokeh which I find the weakest aspect of DA 70 overall).
I still own a Tamron 17-50 and must concur it is an excellent lens...with a really slow AF and the thing is just huge.
DA 21 is small, sharp and come on F/3.2 vs F/2.8 of the Tamron? Really? That is what? third of a stop difference?
The distortion is negligible in real life and easily correctable in PP, sharpness is excellent, as is contrast. What I value most about this lens is its consistency of results under most of conditions and versatility of use. When I traveled to India, I usually brought 3-4 lenses and for the ordinary street shots, the DA 21 was my main "lens cap" (I even had DA 14 with me but rarely used it)
Some of my DA 21 photos
Regarding the last three pictures - this is DA 21+ K-5 low light performance. You can check more at
my dA profile