Mailing the story:
Fedora 19 vs. Fedora 20 Linux Benchmarks
Published today are benchmarks from two Intel systems comparing the performance of Fedora 19 "Schrödinger's Cat" to Fedora 20 "Heisenbug" for various workloads. Especially for those using open-source graphics drivers, Fedora 20 can be worth the upgrade for performance reasons.