I have the first version of this lens and am very happy with it. One knock I've seen commented on about the mkII is the bokeh is a bit more 'nervous' as compared to the first version. Not to say it's bad, but just not as 'creamy' as the original version. Aside from the cost to upgrade, this one quality is of concern to me in contemplating an upgrade. Can anyone comment on this comparison, is it fair to say the mkII isn't quite as nice in this one respect as compared to the original 70-200/2.8 IS?