maw, based on test data from my cars correlated with the *one* 036 test (Magnum Force) that had 120mph data, here are some rough ballparks for 60-120mph:
W124 E500E = 15.0 seconds
W124 E60 = 12.5 seconds
W210 E60 = 12.0 seconds
W211 E63 AMG, for reference: 9.5 seconds
Numbers don't tell the whole story of course, the biggest difference behind the wheel is the part-throttle mid-range torque. It seems even more going from 5.0-->6.0 than from 4.2-->5.0. For reference, the rated torques for 4.2/5.0/6.0 are, rounded up, 300/350/430.