I’ll take whatever is on offer, but 8-10 minimum.
If that's your minimum, then it puts you squarely into medium-format or large-format territory and I can't help you much there, as most of my personal experience with modern-design lenses lies elsewhere and older, vintage lenses in these categories aren't likely to resolve well enough for your purposes.
I’m after sharpness and no fuzzy corners to match the 60-80-100-120 digitars.
But without spending £3.5k
Obviously, a modified Contax 645 35/f3.5 is Cambo's solution ... for now, at least. It's certainly a good lens -- very good, even (
I like mine, anyway!) -- but perhaps falls a bit short of being a
great lens.
And even with paying for Cambo's pricey mechanical aperture mod, you should be able to buy one and have it modified for a lot less than £3.5k, plus the image circle it projects should be plenty large enough for your purposes, so there is that option.
Alternatively, since I presume you already have a way to mount Canon TS-E lenses on your camera and adjust their aperture, you could buy Kipon's smart Canon EF to C645 adapter and use it to similarly preset the lens aperture. (Or for a bit less money, you could buy Kipon's Sony E-mount to C645 adapter and use it with your Sony body to preset the aperture, although this will require you to dismount
both the lens and camera body to change it, which will, I'm sure, eventually become an annoying PITA. Or do as I did and buy an inexpensive, used APS-C E-mount body -- for example, I bought a scruffy A5100 for $125 -- and mount your lens adapter on that instead, so you can leave your working Sony body always mounted on your working camera.)
As a bonus, using an adapter with a C645 35 mm lens opens the door to also using it with a C645 45 mm lens, which can usually be bought for quite a bit less than the 35 mm lens and is similarly a good, but not great performer, and will provide you with some flexibility in this focal length range.
The obvious answer is a S/H gfx when everyone upgrades to a 100mp version and then every lens I have gets wider :ROTFL:
But of course! The nearly universal answer to all these types of gear-related questions is to simply spend more money, upgrade your equipment, and live happily ever after!