I just got my 5D mark III a couple of months ago and I've shot a few things such as portraits, Cyclocross race and now a Track cycling race in a velodrome. I'm must not getting good results with my camera. The photos seem to be pretty noisy at relatively low ISO's 1600's and the sharpness just isnt there with my 24-70 F2.8 L now this is all comparing shots with my 5D Mark II that just had that nice crispness to it. My 5D Mark III is giving me poor results and I'm not sure if it's a setting or if I have a bad copy. HALP!