What effect does head tube angle have on a bicycle?
there's a good write-up about this here: http://www.calfeedesign.com/tech-papers/geometry-of-bike-handling/

In general the steeper the angle the more agile the steering. If you like steeper you might say "quicker, more response", if you didn't like steeper you might say "twitchier".

A 1/2 degree difference is probably not going to make that much difference by itself. The other factors, which headset, installation of headset, stem length, handlebar type and setup, etc., will mask the differences here. As the Calfee page mentions, people will adjust very quickly.

Happy Riding!