Hmmm.

My time in a W123 is limited to a test drive of a 240 that I stupidly didn't buy (although if I had, I wouldn't have my W108!), but it didn't drive all that much differently than the 300D except for somewhat more limited performance. (Ha).

As far as handling goes, they are very similar, except that the W124 reputedly give less warning of reaching the adhesion limit than the W123 as is a bit less forgiving when you get there. Neither will corner as well as a W115/114, but then they have more power (with the turbo), so it comes out about even. The W123 has more body roll than either the W115 or the W124, but that is strictly to give some roll oversteer to prevent the W115 "nasty" of rolling the outside front tire off the rim.......

The W124 has a softer ride due to the multilink rear suspension.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!