Budget was $200m. The advantage for Black Panther 2 is that Wakanda shouldn't have to be built from the ground up again, and I have to imagine that will allow for more time to be spent on the new visuals the sequel has to offer. And time is really what the issue is for CGI, as anytime there's a new breakthrough that will allow for better effects faster, the studios ask the houses to simply do more FX shots rather than doing the same # of shots better.
EDIT: Like, even within the first teaser, almost every shot in Wakanda has some sort of CGI component in addition to lavish sets and gorgeous costumes.
The other MCU films take cost-cutting measures via their settings. The Iron Man films have a lot of small interiors with so-so production design. The Avengers set almost the entirety of Act II within a grey helicarrier set. Thor 1 largely takes place in New Mexico, The Dark World takes place in a fairly monotonous version of Asgard, and Ragnarok has a similar budget to BP and similar problems with its effects work. Cap 1 is largely set work, the same as Cap 2. The Guardians films get a lot of mileage out of the cramped grimy interiors of the spaceships and the vacuum of space.
I'd be very curious to see what the Warrior Falls set and compositing cost on its own, as that thing must have been a nightmare to construct and operate with tons of shots and coverage between the two scenes set there. And it's something we might never see in the sequel.
EDIT: Also, any deleted scenes that were cut late are going to have had money spent on them. The assembly cut was four hours. How much money went into stuff we didn't see or only got a glimpse of (like T'Challa's office, which we barely see when Nakia retrieves Ross after Killmonger wins the throne)