Following my previous post, I've done some testing on my phone wi-fi performance compared to a full-blown PC.
Setup is the same as in the previous post, even the phone location is the same as the previous laptop location.
Data transfer was between the Defy and the desktop PC, wire-connected at gigabit speed to the Netgear WNDR3800.
So, while the Defy supports 801.11n, it takes no advantage of it.
The 5Ghz network is not even recognised and the 300Mbs connection was not very reliable, I had to retry a couple of times before getting a full transfer.