For your situation, I honestly think you gotta balance that peak technical performance with what actually makes sense for the wallet. While the Leica APO-Summicron-SL 35mm f/2 ASPH and Leica APO-Summicron-SL 50mm f/2 ASPH are basically the sharpest lenses ever made, they're SO expensive. If you're shooting landscapes at f/8 on a tripod, you might be hitting diffraction limits before you even see the full benefit of that APO glass anyway. Here’s how I’d break it down from a value perspective: 1. **The Peak Performance Choice**: The Leica APO-Summicron-SL 35mm f/2 ASPH. It's got that micro-contrast that makes images look 3D. But yeah, it's a massive investment. 2. **The Practical Pro Choice**: Sigma 35mm f/1.4 DG DN Art for L-Mount. Honestly, this lens is incredible. On the SL2 sensor, the edge-to-edge sharpness at f/5.6 or f/8 is nearly indistinguishable from the Leica primes in real-world shots, but it costs a fraction of the price. 3. **The Zoom Option**: The Leica Vario-Elmarit-SL 24-90mm f/2.8-4 ASPH is solid, but if you want to save cash and get better corner resolution, I'd actually look at the Sigma 24-70mm f/2.8 DG DN II Art for L-Mount. It’s technically improved over the first version and holds its own against the Leica zoom for way less money. I’d avoid adapted M-mount lenses for high-res landscapes. The sensor stack on the SL2 is thick, so you often get smearing in the corners with wide M-glass. Stick to native L-mount to really squeeze that detail out. Basically, if you want the best bang for your buck, the Sigma Art primes are the way to go tho. Good luck!!

Building on the earlier suggestion, if you're looking for peak reliability without the Leica tax, you might want to consider the Sigma 14-24mm f/2.8 DG DN Art. For landscapes, it's honestly one of the sharpest wide-angle zooms ever made, and it handles the SL2 sensor like a champ. Just be careful with adapted M-mount glass tho. People love the idea of using M lenses because they're tiny, but the sensor stack on the SL2 is thicker than on M cameras. This often causes light rays to hit the sensor at awkward angles, leading to smearing in the corners of your landscape shots. It's basically a dealbreaker for high-res work where you need that edge-to-edge detail. Native glass like the Sigma Art series is designed for this specific sensor geometry, so you won't run into those optical issues. Plus, the sealing is much better for long days on a tripod in the wind or mist... definitely feels more robust than some of the lighter options. TL;DR: Adapted M glass often smears on the SL2 sensor stack. For absolute sharpness and reliability, the Sigma 14-24mm f/2.8 DG DN Art is a safer, high-performance bet.

Man I just stumbled on this thread and honestly I'm so hyped for you! That SL2 sensor is a masterpiece and still holds its own against anything else out there. I went through a whole phase of trying every L-mount lens I could find when I first got into the system years ago. Tbh while the Leica glass is amazing, I had a total lightbulb moment when I picked up the Panasonic LUMIX S PRO 50mm f/1.4. It is big and heavy but the micro-contrast is absolutely stunning for landscape work. It gives that 3D pop everyone talks about and the sharpness is just... wow. You should also seriously look at the Sigma 14-24mm f/2.8 DG DN Art. I've used it for tons of wide vista shots and the edge-to-edge sharpness at f/8 is just ridiculous. It's basically my go-to now when I'm hiking with my tripod. If you want something a bit more specialized, the Sigma 35mm f/1.2 DG DN Art is a beast too. It's probably the sharpest 35mm I've ever put on my camera and I dont say that lightly. It's been a long journey finding the perfect kit but those two really changed the game for me. You're gonna have a blast with whatever you choose tho!

I spent a long time thinking I had to spend a fortune on APO glass to really feed the SL2 sensor. Last year I grabbed the Sigma 24mm f/3.5 DG DN Contemporary for a trip to the mountains because I wanted something light for the hike. I was honestly surprised by how well it held up at f/8. The edge-to-edge detail is very clean and it handles the 47MP sensor without much effort. I ended up adding the Sigma 35mm f/2 DG DN Contemporary to my bag later on for the same reason. They both have a solid metal build that feels right on the SL2 but cost way less than the native Leica equivalents. Tbh you wont notice a massive difference for landscape work when stopped down on a tripod. Quick tip: Stay around f/5.6 or f/8. If you stop down to f/16, you'll start to lose that micro-contrast bite because of diffraction. TL;DR: The Sigma I-series primes deliver pro-level sharpness for landscape work at a much lower price point.