What is the absolute sharpest prime lens available for Sony mirrorless right now because I am seeing so many conflicting reviews and charts online and I need some real world feedback.

I have been shooting on the A7R IV for about three years now so I am used to that 61mp sensor showing every little flaw but I ran into a weird issue last week during a high-end jewelry shoot here in Seattle. I was using my 50mm f/1.2 GM which is usually my workhorse but even stopped down to f/5.6 or f/8 it just felt kinda soft in the corners which was super unexpected for a lens at that price point. I dont know if it is a copy variation thing or if I am just hitting the limits of the glass but I need something that is bitingly sharp from edge to edge for some studio work I have coming up in late October.

I am looking at the 135mm GM or maybe one of the Voigtlander APO lenses but I am worried about the manual focus speed for my workflow. My budget is around $2,000 so that opens up most of the G-Master line but I really just want the one with the highest resolving power possible to match this high res sensor. Is the 35mm GM actually better or should I be looking at the 50mm f/1.4 instead of the 1.2? I just need that clinical surgical look for these macro-style crops...