My career player (#5 bat, pro) has been steadily improving since the patch. Recently posted a career high in first class of 90 from around 130 balls. I find that I can generally play one good long innings before my concentration starts to waver. If I face 100+ balls in the first innings, then going directly into the second innings I sometimes find it difficult to readjust my mindset and start building an innings again. This is a good and realistic challenge though.
As I'm nearing the end of the third season I will try and post some stats when I get home later. The PS3 patch hit mid-season and my stats pre and post-patch are markedly different. I seem to have improved more in First Class than in Pro40 or T20 (perhaps in part because coming in at 5 often leaves me 1-10 overs to bat with the field spread, which can be challenging). In first class I am trying to play the anchor role - other formats trying to play according to the situation.