My photo life was much simpler when my DA16-45/4 was my only lens (on my K10D)...
It's really a great value lens and agree with others that optically there is redundancy with the DA15/4. I love the 15, it's all about size contrast color and that UWA FL (not sharpness) but requires an "up close and personal" foreground otherwise it's function is lost to other WA.
I have struggled parting with my 16-45 because of how useful it is at avoiding lens changes, but it is bigger. 15/4 + 40/2.8 is smaller than the 16-45 and mimics how I use the 16-45, at the ends.
I would never carry both the 15 & the 16-45 in my bag at the same time, but I also would never not have one of them (and why I need to sell my sigma 10-20.)
Last edited by Stickler; 07-29-2015 at 10:42 AM.
Reason: incomplete thought