"warm" analog vs "lean" digital sound

Hi folks, when comparing my vinyl with digital rig, I'm experiencing a large difference in sound signature. While vinyl replay gives a big, warm and full sound, digital (through CD's) is a bit lean sounding with far less midrange fullness. I know both media have different sound signatures, but the differences are way to much. Between good analog and good digital there should be more similarities than differences in my opinion. With my friend's rig I don't hear these big differences between analog and digital, despite a less "sophisticated" audio gear. How do you explain these differences? Is it because of the phono set up that gives "overblown" midrange? Is it because the digital rig is inherently thin sounding (I have Accuphase DP-90/DC-91 combo)?

Chris