I have a ColorMunki Display and I am calibrating my 27" iMac. Overall, my screen matches my prints really well, both in brightness and colour. The only colour that doesn't look quite right is yellow. I have a set of five test prints and I notice in the grass on one of them, and I also have a bullseye target print that my lab sent me to use and I definitely notice it there.
The yellows on the print look very deep and rich, slightly darker and warmer than my screen. My screen makes them look much lighter and brighter, like a lemon yellow.
Am I just being picky?