I have heard different reports between the two. I'm still on 1.0 and liking the game so far! Yes there is some issues like the player awareness can be frustrating at times and I rely a lot on COM pressure to mitigate it. Shooting can be a bit more powerful, very hard to get enough power with sufficient accuracy in 25-30 yard shots, maybe I just haven't mastered it yet, shooting feels a lot different than last year.
I heard 1.1 has more powerful shots but the inertia of players is lost. I wonder if the lost of inertia is related to the increased responsiveness. I like the inertia of 1.0 so I'm not willing to let go of that in favour of more powerful shots yet. I'm also wondering if the PES 2013 program that allowed global editing of stats will be able to be replicated for 2014. As i'm thinking of a global stat increase of "kicking power" related stat would make a difference.
I personally find the responsiveness of 1.0 pretty good actually, feels realistic, less arcadey than previous versions. I haven't tried 1.1.