+1 on both being amazing. Part 2 is pretty sweet so far. I am not doing much this time through other than going through the story. After I beat it, I will go back through and get the treasures and trophies just like I did with the first one.
I am the same as Matt. I wouldn't start this one until I went through the first again, only difference is that I played it through last week so I would be ready when it came out today.
First one starts out with action on the boat right from the gate. The second starts out pretty breathtaking, with a good amount of suspense built in. I won't spoil it, but they did good with the beginning. Hopefully it stays intense all the way through.