It does feel a lot better but it would be very hard to quantify. I also reset it to factory defaults before handing it over for repairs. So a lot of stuff that may have been causing background battery drain may have been wiped in the process...
I had my phone since March 2022 and I was using it with the protect battery option enabled which limited charge to 85% and battery saving enabled since I got it. But I sometimes charged it multiple times per day so there would have been plenty of cycles on it by now.
I now limit it to 95% via "Modes and Routines", and I am currently using it with power saving disabled.
My understanding with regards to battery longevity is that it it worse for a battery to drain to 0% than for it to be charged to 100%. So I try to charge it before it gets to around 20%. I never let it go to 0. Also try to avoid charging it when it is warm, heat is not good for batteries.