Hey guys I am getting the canon 70-200 mm USM L f2.8 lens soon and I am just wonderin it focus speed, since I do a lot of fast paced sports. I know it it one of the fastest focusers out there but I am just wondering the actual time. I have a 70-200 EF lens now and it prolly focus about 1sec. Which is way to long. I'm hopinng that the USM could get focus within .5 of a second.