It's significantly better on some benchmarks and significantly worse on others. There's no clear winner and ext4 is much more widely tested and has way more dev

It's significantly better on some benchmarks and significantly worse on others. There's no clear winner and ext4 is much more widely tested and has way more development time focused on it. Looking at only a few aspects of performance can result in either of ext4 or f2fs being seen as a clear winner but it's not representative of the whole picture.