Well not exactly, but those nice people over at Phoronix have comparison benchmarks between Ubuntu and other Linux distros (something which Ive always been too lazy to get around to) I would go into the results here, but it hardly seems fair when Phoronix have made interesting and detailed reports, so Ill recommend you visit their site!
The one I was most interested in was Ubuntu V Fedora, and the results showed on average pretty much the same performance. Other interesting benchmarks were Ubuntu 7.10 + Wine V Windows XP.
Without further ado, Ill link to the reports below and you can see for yourself:
There are others, but these were the ones that I found most interesting to me. Check em out! Maybe this will be the start of other direct comparisons?