Phoronix published a review on the Linux 3.15 SSD File-System Benchmarks
A quote from the article:
Now that kernel development activity is settling down for the Linux 3.15 kernel, here are some benchmarks of the EXT4, XFS, F2FS, and Btrfs file-systems compared to the stable Linux 3.14 kernel performanceLinux 3.15 SSD File-System Benchmarks @ Phoronix