Not side by side, but I wrote down the signal strength and location of 3G and LTE on my Evo, then when I traded for the Galaxy Nexus, I compared it to my notes. Blew the frickin' doors off the Evo! Just for an example, I took the bus and train 45 miles to trade for the Nexus, and on the Evo, I got LTE 0 times. On the way back with the Nexus, I got LTE over a dozen times. Stock rooted on both the Evo and the Nexus, not custom ROMs.
Edit: Thought I should post a link relevant to the Nexus 5, being that's what this thread is for: http://www.phonesreview.co.uk/2013/09/22/nexus-5-and-ubuntu-connection/