I've had my 9SE V2's for about a week now. To my ears the V2 has more extended, tighter, and more articulate bass. It has better instrumental focus/clarity from top to bottom.
It seems more transparent and detailed than the V1. And the highs are airy and extended -- but perhaps more importantly, the highs are now silky smooth. By comparison, the original version had a mild grainy quality.
I think the V2 actually sounds a little tubey in the midrange. By that I mean I hear more inflection on vocals and more nuance on guitars and other midrange instruments.
Who knows, they may sound even better as they continue to break in. And if not, I'm quite happy with their current level of performance.