The practicality of circumstances should decide the issue. If traveling with a group, where the time availability and lack of setup space and opportunity to change lenses are compromised, the DA 16-85mm is a no-brainer. If you can fit in the DA* 50-135mm, it is not a huge lens, and there may be a time and opportunity for lens-changing, where it could be of use for its reach, and where its f/2.8 aperture might be needed. It does not seem a tour in Austria (vs. Australia) will entail telephoto shots of wildlife as much as it will landscapes and city scenes.
For me, having a DA 18-135mm, of which I am very fond, I often travel about on foot or bicycle with my KP, being independent of others in a group and their time table, so I will by choice, in dealing with scenic surroundings, prefer toting my 20-40mm LTD along with my HD 15mm LTD and DA 70mm- or FA 77mm ltd if going into low-light hours. This is to keep bulk and weight to a minimum with very high quality and capability, even in low light. Nonetheless, I do often have my DA 18-135mm along on my backup camera body in my car or room, in case I will need more zoom range.
However, if my situation were touring with a group, I would probably just go with my DA 18-135mm lens to avoid the necessity of lens-changing, maybe along with the DA 15mm LTD just in case.
Last edited by mikesbike; 11-23-2019 at 12:58 AM.