I just got the new 16-35 IS lens from fedex...ordered direct from Canon...anyone else got this yet?  I just did some prelim tests on a brick wall and some landscapes and I am not that thrilled with it. It is definitely better at the edges and corners than my 17-40 at 16mm....but it is not as sharp in the center and lacks the pop of the old lens there. Also...it has pretty soft corners at

35mm and again not as sharp in the center. I shot tests at f4, 5.6, and 8....the lens is actually the most impressive wide open...it does not improve much when stopping down....please share your experiences...I want to find out if I got a bad copy.