I currently use a Fuji camera for dynamic portrait work in a pretty confined studio space. My favorite photos are done in natural window light, often low-light for a soft, moody effect. That means I rely on fast, wide primes like the 18 and 23mm f/1.4.

My thinking is that FF could benefit me by letting me use longer lenses, which may be more flattering for portrait work, while offering better low light response and increased subject separation. Seeing the stuff coming out of the Nikon Zf, for example, left me with a good impression.

However the lens options in most FF systems aren't inspiring. I've grown used to Fuji and Viltrox offering super sharp, fast, well-built primes for (relatively) reasonable prices.

My notes after looking at the major systems:

Nikon Z

There's an S-series 24mm f/1.8 for $1000. It's a plastic lens body with good, but not amazing optical performance according to the reviews I've seen. The S-series is supposed to be their top end, so that's concerning. I lose light and get worse build quality.

Third party options are pretty scarce, especially for FF, though Viltrox has some older wide angle f/1.8 options.

Adapted F-mount lenses are an option, but the f/1.4 F-mount lenses are both expensive and optically much worse (or with more character, if you prefer) than current-generation lenses.

Canon RF

Amazing glass at eye-watering prices. They love zooms and certain primes, but not much else. Super slim pickings, both first and third party. Adapted L glass seems like the only route here.

Sony E

They have lots of great first and third party options, but I'm not in love with their cameras despite their technical wizardry.

Fuji X

First and third party options for fast, wide primes with excellent wide-open image quality. But it's APS-C so I need to go for very short f/l to work in my physical space which aren't the most flattering for close-in portrait work, and I rely on high ISO noise reduction in post more than I'd like. Artificial lights can help, but have a different quality than the natural light.

Fuji GFX

Amazing, but a tad out of my hobbyist price range.

I suspect for now I'll just stick with what I have. It works. I'm just wondering what lenses people go for in their FF setups. My situation seems like it lends itself to the strengths of FF, but I don't see the lenses to go with it.