I love the bokeh off this lens, its cool.
I find that the easiest way to find out whether i like a lens or not is to shoot it, compare it, then decide. One can goto Cathay, check out the 70-200, take some shots and note the settings(make sure Vr is off). Then put these same settings on the current lens and shoot the same scene in Cathay. Of course i was comparing the 70-200 with my tamron...Once you compare these shots, you can see for yourself and decide if its worth paying for.
This is of course a "man on the street" method, if you want reviews and what others think there are already plenty of these around.
Goodluck!