I compared my S20FE 5G to a friend's OP11R, the primary camera quality was similar. So I highly doubt OP12 has inferior cameras. Unless you are too much into Samsung specific features, I doubt you will miss anything, should be a good upgrade, esp the charging.
Don't think I will buy a Samsung again, primarily due to super slow charging and battery issues.
I really hope Samsung, Google & Nothing jumps to 65W charging at least. They are just too slow now considering battery life is improving very slowly over the years due to efficiency gains (lack thereof in 2021 & 2022) or battery size increase.
Regarding battery life, sadly it is the fault of Samsung fab. Exynos, S888/888+, 8 Gen 1 (not 8+ Gen 1) & Tensor are made at Samsung fab, known for poor efficiency. Sadly Samsung is shooting in their own foot by having flagships use chip made at Samsung fab. S23 rectified it but S24 & S24+ returns with exynos (better than earlier but is still inferior). I know people who jumped from S21 to iPhone 13 & saw a good jump in battery life, such people will never again buy an android phone in the future.