After the earlier small, low-power Linux PC testing I ran some early comparative tests of Ubuntu 12.04.3 LTS against Ubuntu 14.04 with its current daily ISO as of today. Plenty more 12.04 vs. 14.04 LTS tests will be coming (and with 13.10 too) from a mixture of hardware and benchmarking various subsystems, but these results are just to satisfy anyone's curiosity this weekend.
The system details and other early few results are on OpenBenchmarking.org via 1401257-PL-INTELUBUN79. Have a Linux benchmarking request? Let us know via Facebook, Google+, or Twitter.