The W140 brings a lot of things that appeal to
my taste over what the W126 offers - softer ride with no loss in handling ability, heat through center vents, fully adjustable AC blower speed, lighter steering, smaller steering wheel, tilt steering, above average stereo, quieter cabin, bigger cabin.
The SDL is my daily ride so I haven't put more than 100 miles on the SE since I got the S420 4 months ago. The SE will not be adorning my driveway shortly.
The W140 is not for everyone and thankfully so. Makes them more affordable today than a comparable W126 was 3 years ago.
As far as looks, it's a discussion point, not a decision point. If looks really mattered to me I'd be driving a W189 or W109 with hubcaps and wondering what's wrong with everyone else
Sixto
95 S420
91 300SE
87 300SDL
83 300SD