I am seriously considering selling my 18-105G and getting a 16-70Z. This is not about IQ, but if the Zeiss were clearly better it would be an easier decision. I am quite happy with the IQ from the 18-105G. I think it is a wonderful standard lens. So why do I want to switch? 1. The size is starting annoy me. It is not big by DSLR standards, but it does turn my a6000 into the size of a DSLR with a kit lens attached. I tried to convince myself I was fine with it, but I am not. I find myself leaving it home in favor of the kit lens more and more. This way I can throw my Rokinon (UWA) and another prime (fast) in my Domke bag. 2. The weight - I have slight curve in the spine (scoliosis). Because of this, the muscles in my back can become inflamed during long hikes. The more weight I carry, the quicker it sets in. Particularly one-sided weight like a camera slung over the shoulder. 3. The focal range - Unlike when I started and I shot more nature, I am now leaning to landscape. This means I care more about the extra 2 millimeters on the wide end. 4. Lack of close focus - One of the weaknesses of the 18-105 is its magnification (.11x) vs (.23x) for the 16-70 Zeiss. Neither is a macro, but the Zeiss is very versatile for the type of stuff I would shoot. Anyone who has tried to shoot a dragonfly or bee on a flower with this lens knows how frustrating it is. You end up with a picture that you have to crop much more than you would expect. In the end, it is soft and discouraging. As a result, I only use my SX50 for such endeavors. I have never had a lens with so little magnification. Even the kit is .21x. So my question is, are those things enough to justify the amount of money I will loose making the switch? Would I regret it? Please help because I don't have money to burn, but I want to be comfortable with my kit.