Sooo I had the same issue when I moved to the a7R V... my old glass looked like mush lol. Before I give advice, are you shooting astro too or just daylight landscapes? 1. The Sony FE 20mm f/1.8 G (~$900) has insane resolving power for that sensor.
2. The Sony FE 14mm f/1.8 GM (~$1,600) is basically a clinical prime. Lmk! Honestly, I learned that 61MP shows every tiny lens flaw...

I went through this last year. I was sooo worried about the cost of GM glass... basically a budget nightmare. - Sony FE 20mm f/1.8 G: Insanely sharp and way cheaper than the GM. Fits 67mm filters easily!
- Sony FE 12-24mm f/4 G: Cheaper zoom but I noticed soft stuff in the corners at 61MP. Honestly, I'm super happy with the 20mm prime... it just works well for my landscape things. gl!

Totally agree that the 20mm G is basically the sweet spot for price and performance. But ngl, I’ve been doing some deep dives into other brands lately because those Sony GM prices are SCARY. Tbh, the third-party market has some options that might actually handle that 61MP sensor better than the older Sony G zooms. - Sigma 14-24mm f/2.8 DG DN Art: People say this is the "GM killer" for landscapes. It's way cheaper than the Sony 12-24 GM and iirc it's famous for being crazy sharp even in the corners. Only downside is the front element is still a big bubble.
- Tamron 17-28mm f/2.8 Di III RXD: This one is super popular for being small and taking normal 67mm filters. I’ve seen some debate if it’s sharp enough for the a7R V though... maybe some softening at the edges compared to a prime?
- Sigma 20mm f/1.4 DG DN Art: If you like that 20mm focal length but want the "Art" series rendering, this is a newer lens designed specifically for these high-res mirrorless bodies. I'm still a bit of a newbie with this high-res stuff, but it feels like the third-party glass is catching up SO fast. Maybe worth looking at those before dropping 3k on a GM?

Ok so, in my experience, that sensor is reallyyy demanding. Honestly, I'd suggest sticking to the manufacturer's top-tier prime lenses if you want to keep that edge-to-edge resolution (at least thats what worked for me). I've tried many setups over the years and zooms just introduce too much risk with field curvature... plus, those bulbous elements are a total liability! Go with Sony's high-end primes, they're basically designed for this workflow. Stay safe!!

Same setup here, love it

> Which lens do you think truly maximizes the detail for high-end landscape work without hitting diffraction too early? Ngl I am basically in the exact same boat and it has been driving me crazy for like five months now. I am so happy with the Sony a7R V as a body but finding the right glass that doesnt ruin my 100mm filter setup while keeping those corners sharp is a total nightmare. I’ve been hunting for the perfect answer since I upgraded and honestly still havent found anything that feels like a total win. It is just so frustrating when you know how much detail that sensor can pull but you feel limited by the physics of the glass... still looking for that perfect middle ground myself tho.

Exactly what I was thinking

Saw this thread earlier and figured Id jump in since Ive been shooting with the R series for a while now. That 61MP sensor on the Sony a7R V really does expose every little flaw in your glass, especially out toward the edges. Before you make a move, I gotta ask: are you 100% committed to staying with your current 100mm square filter system? Because that basically rules out most of the high-end ultra-wide zooms unless you want to mess around with custom DIY adapters or massive 150mm setups, which are a total pain to hike with. Also, do you find yourself needing that extreme 12-14mm range often, or are most of your keeper shots usually closer to 20mm? Knowing your most-used focal length would really help narrow down if you actually need the zoom or if a high-performing prime would be better.