I should have written it down, but I think the update was 900mb+ in size.
As far as noticing anything, well my wife got the game as a Christmas present, so we had only started playing it yesterday. When I went to install it, it asked to install the update along with it.
The game itself seems to be running well and looks good, so if there is anything in particular you would like me to check in game, I'd be happy to. Was there an issue with glitches or something before the patch?
I think the update was to make it 1080p. Or was that just the PS4 version?