Unfortunately, I had some real issues with internal fogging on a damp trek last year, it was honestly so disappointing. I dont really trust some seals anymore. If you want to save money for better waterproof gear, maybe check:

• Panasonic Lumix S 28-200mm f/4-7.1 Macro O.I.S.
• Panasonic Lumix S 20-60mm f/3.5-5.6 found used Quick question tho, are you mostly shooting landscapes or do you need it for low-light pub shots too?

In my experience, that 4mm difference on the wide end is huge. 24mm is basically the bare minimum for landscape work in places like Scotland. I have tried many lenses over the years, and 28mm always feels just a bit too tight when you are standing in front of something massive like the Quiraing. You will end up doing panoramas which is a total pain when it is raining and you just want to get the shot and keep moving. If you want the f2.8 but also need the 24mm wide end, you should really look at the Sigma 24-70mm F2.8 DG DN Art. It usually retails for exactly $1099, so it hits your budget perfectly. It is definitely heavier than the 28-70, but the weather sealing is a lot more robust. For a hiking trip where it might pour, I wouldnt risk a lens that isnt fully sealed. Honestly, the S5II has such good IBIS that you can usually get away with f4 for most shots anyway. But if you really want that one-lens solution that does everything, the Sigma Art is the way to go. Just make sure you have a good way to carry it. I use a Peak Design Capture Clip v3 on my hiking bag so the weight stays off my neck. It makes a big difference when youre doing ten miles a day. Tbh, id rather carry an extra few hundred grams and have the right focal length than save weight and miss the scale of the landscape.

Man I wish I found this thread sooner. Would have saved me so much hassle.

I have been using the Panasonic Lumix S 24-105mm f/4 Macro O.I.S. on my S5II for a while now and honestly it is the most logical choice for a trip like Scotland. If you are hiking in the rain, you need that full weather sealing. The Sigma 28-70mm f/2.8 DG DN Contemporary is a great little lens, but its sealing is mostly just at the mount, which isnt ideal for the highlands. Plus, those 4mm at the wide end are absolutely massive when you are trying to capture big landscapes. 28mm always feels just a bit too tight for me in those situations. The Dual I.S. 2 you get when pairing the native Lumix lens with the S5II body works very well. I have been able to pull off long handheld shots without any blur, which makes the f/4 aperture a non-issue for most static subjects even in lower light. The 0.5x macro is also surprisingly useful for detail shots of textures or nature when you are on the trail. I think I paid around 1100 for mine and have no complaints about the optical performance. The Sigma is lighter, sure, but for a one-lens setup, the versatility of 105mm and the peace of mind with the build quality makes the Panasonic the superior tool. You really wont miss the f/2.8 as much as you would miss the 24mm field of view. Its just a better do everything glass for unpredictable environments.