Hi Jonathan, welcome to the forums mate. That's a pretty nice kit you've got there.


To be honest with you I can't fault anything in your process so there's no obvious reason why you wouldn't be achieving sharp results. I also shoot with the 5d Mk II and a few L lenses and I get very sharp results.


Remember, when looking at images on your monitor often you are zooming in to see the fine details, a lot of the time (especially in print, magazines etc) professional images are not viewed at that level of detail so you won't pick up those deficiencies in the image as easily. I always find that photos look much better printed anyway.


If you haven't already, apply a sharpening filter in post. I personally like the smart sharpen filter (Photoshop 7/ CS4) at around 0.4 - 0.7 radius and 80-100%. That will really bring out the fine details and anything you don't want super sharp you can just mask out.


Hope you have some luck.


Cheers, Ben.