If SE's more recent work is any indication... well, let's just say best is a very subjective term.
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Looks like until they take 6 months to optimize for PC you'd need a $2000 PC to play it as the PS5 does.
Source from Yoshi-P
https://tech4gamers.com/final-fantasy-16-pc/
Wtf kind of $2000 PCs is he looking at? A good $2000 PC is an absolute monstrosity. You can absolutely get PS5 performance below that price point. All I really got out of this is that FFXVI is so poorly optimized that the PS5's complete devotion to performing a single task is something of a crutch. Dude's definitely underestimating sub-2000USD PCs. Sounds like the statement is half meant as a PS5 ad.
I think he didn't mean PS5 performance in general, but rather the optimized performance he's been able to realize by working closely with Sony engineers on optimization and being able to leverage designing for one single console and console architecture.
He did say in the article that after a few months of optimization it should run just fine on lower spec PCs, thus the longer than 6 month time after release for a PC port.
Ah. Fair enough, then. That's probably true. Sony having a direct hand in development probably does mean it's quite specialized at the moment. Either way, I'm kinda glad to know they'll be spending so much time optimizing the PC port. A lot of games that run like crap have been slipping through the cracks lately, and not just from Square-Enix.