Realistically, how much improvement should I expect in terms of photos and videos going from an S23+ to an S26 Ultra?

We have some family trips and events coming up, so I've been getting the itch to upgrade my over-a-dozen years old camera system to a better, newer one (I was thinking of a Fujifilm X-T30 III, fwiw). But I couldn't justify the purchase financially because I already know that the camera won't see a lot of use outside the pockets of vacations that are few and far between.

So with the new flagship Samsung models coming out, I've been considering - as an alternative - upgrading from my current Samsung S23+ to an S26 Ultra, which is an upgrade I'll be able to appreciate on a daily basis.

Based on what I could gather it will still be an improvement in terms of photo and video quality/capability over the S23+ but of course I'm not expecting the kind of capture quality like photos shot from an actual camera.

Realistically, how much improvement should I expect in terms of photos and videos going from an S23+ to an S26 Ultra?