Unfortunately I don't know yet because I updated for Xcode 27 + iPhone dev, so having an iPhone plugged in 24/7 is heavily spewing the results towards "much worse".
If I can still reply mid-to-late next week I'll let you know.
It doesn't seem much worse to me if at all. Not a noticeable difference. That said, the laptop is only a year and a half old, with the battery cycle count at 314.
I also wonder if I'll have a "oh, the battery life _is_ much worse" moment soon, but not yet!
There’s always some claiming this after any iOS/MacOS update only for it to quietly disappear until the next upgrade.