I'll try and repeat that experiment later today, and share the results.
OK, here we go, crude and probably not the best tests, but…
1gig file (1024^3 bytes), passed to/fro via Samba share. Fedora server at remote end, accessed by 2009 Mac Mini , OS/X 10.8.5 client, WiFi via Billion 7800DXL.
No special effort to 'quieten' either system, update checkers and other housekeeping tasks may have been chattering away.
File copied by 'cp' command, source file 'touched' between copies. Wireless distance about 15ft, strictly through two layers of stud & plasterboard walls, but also obscured visibility thorough open door.
Gigabit lan, 3 runs each way...:
read time write time
33sec 18sec
32sec 18sec
32sec 19sec
I reckon that's average read rate circa 268Mbps, write rate circa 477Mbps
2.4GHz wireless…
160sec 138sec
154sec 160sec
156sec 138sec
I reckon that's average read rate for 2.4 GHz circa 52.5 Mbps, write rate circa 56.0 Mbps
5 GHz wireless…
130sec 125sec
136sec 145sec
151sec 145sec
I reckon that's average read rate for 5 GHz circa 59.0 Mbps, write rate circa 59.0 Mbps
Reconsidering my previous comments, it's actually the 2.4GHz rates that I find to be a 'wow', being about a five fold improvement compared to the last time I attempted to measure WiFi rates, between an old DG834GT and a 2005 Dell laptop. But the 5GHz was only marginally better.
The OS/X network utility claimed zero errors during the duration of testing, which I don't entirely trust.
Feel free to check my arithmetic, or to point out flaws in my method, I'm definitely thicker than I used to be and rarely take offence.