Yes, I have both lenses, the DA16-45 and the DA*16-50.
I can't really recommend you one over the other, it really depends
what sort of photos you are doing.
They are optically both very good. From an AF point of view, the AF
speed is similar with both lenses, the SDM does not show a speed
advantage, but SDM focuses nearly silently which is a great change.
The DA*16-50 has the advantage over the 16-45 regarding low light
photography (shooting at f2.8) and a weather sealed construction.
So, if you shoot frequently in dark, dusty, rainy environnement,
the DA*16-50 is the way to go, otherwise, the 16-45 is enough.