I just got my first full frame, the 5D Mk2. I've been shooting with a couple of 50mm (Canon 1.8 and Sigma 1.4) and can't seem to get consistently sharp shots. I've definitely gotten some very sharp shots but more fuzzy than sharp. I started googling (this can be unhealthy, I know) 5D Mk2 and focus issue and was a little overwhelmed by the number of unhappy users out there. I did some focus tests and it was a little all over the place but both lenses gave me pretty poor results. $2.5K is a lot of money for me and I am bit concerned that my keeper rate will be disappointing. What do you think? Is it a micro adjustment issue perhaps (seems unlikely since I've used two different lenses) or is it just a matter of getting to know my camera a little better? Would greatly appreciate any feedback you might have.