Live 2/5 NL players are slightly better and slightly more aggressive, but there is not a huge difference between live 1/2 NL and live 2/5 NL.
If you want to familiarize yourself with the level of play at live 2/5 NL, you should check out Live at the Bike shows when they are showcasing $500 max 3/5 NL or $1000 max 5/5 NL. Live at the Bike is an online streaming show where they show hole cards for players in an LA cash game over 2 hours or so (15 minute delay, I guess).
If you are really serious about making a painless transition from live 1/2 NL to live 2/5 NL, you should check out www.crushlivepoker.com
. It is an poker training site dedicated to live poker. Besides the expert level poker strategy
podcasts by Bart Hanson, you get to see training videos that feature footage of real cash games with actual live low-stakes NLHE players doing typical live low-stakes NLHE stuff. I think you can still sign up for a free months' trial subscription at CrushLivePoker using a promo code just to check out the live 2/5 NL content without paying anything (10% chance that the Crush Live Poker promotion has expired...although I doubt it).