I currently have an a6000, SEL1650, SEL55210, SEL28F20. I also have a Rokinon 12mm on the way. I am planning a trip in a few months to Europe (London, Paris, Bruges, and Iceland). I am looking at adding either the SELP18105G or the SEL1670Z for this trip. I have read countless posts on various sources about this exact question and there never seems to be a conclusive answer. And I don't expect to get one here. I'm just looking for another discussion using my exact combination of lenses. I primarily use the 55-210 for wildlife and I don't anticipate much of that on this trip since it will mostly be in cities so I will plan to not bring that lens. I like the 16-50 somewhat (mainly for the size). It's lacking in IQ and I would want a longer focal length on the long end since I'm not bringing the 55-210. The 28 is my favorite lens by a long shot. It's on my camera 90% of the time right now. I would love to bring it with me, especially for low light (food, restaurants, streets at night, etc.), but it seems silly to double up on focal lengths. Could the Rokinon handle these kinds of shots okay or would I get sick of manually focusing it all the time? The Rokinon would make a heck of a lot more sense during the day for the wider angle shots (landscapes, building interiors, street shots, etc.). My primary lens will either be the SELP18105G or the SEL1670Z. Right now, I’m heavily leaning towards the 18-105. It sounds like IQ would be mostly the same for them. I really like the added focal length. And, of course, the cost is much more appealing. The only things that concern me are the 18mm minimum focal length (vs 16mm on the Zeiss). If I bring the Rokinon it would cover me well but I would have to swap lenses. The other concern I have is the overall size. The thing is massive. It’s bigger than the 55-210 and heavier. I would probably have a backpack for storing most of the gear, but depending on what I was doing, I would most likely have the camera around my neck. I’m worried this will be too heavy around the neck. Again, I know I’m not going to get a definitive answer from this, but if anyone has experience with a similar setup or a similar trip, I would love to hear some thoughts, opinions, concerns, etc.