Do you mean the W140 series which was the one billion dollar investment by Merc way before its intro. The W140 is a Barge and I owned one for six years. Positives over the 93 Lexus I've recently bought to take its place? Seats made for Germans and not for Japanese (todays obesity in mind) soft closure doors, I'm having to get used to slamming the doors again, and its irritating. Wing mirrors that fold in electrically, an electric rear sunblind helps stop leather Sunburn when parked in hot weather.
Also no Cambelt expense as cam chains.
I would say after a long drive either in the UK or abroad (and I do a twelve hour drive in France) that I am just as refreshed as I hope to be in the Lexus shortly. The Lexus is a bit shorter (I had the LWB version of both the W140 and the W126) which I'll get used to when using it as a pack animal.
The Lexus engine is without doubt quieter than the straight six (probably the Cambelt plus!) but I can't compare against the V8 420 or 500 W140, only against the V8 500 W126 series. It was a beautiful reliable Engine and pretty quiet.
The Lexus after two decades feels tighter than the Merc.
I loved the Barge but am sure I'll love the Lexus equally as well now its taken its place.
My mistake it was the W140.
Once when in the back of one, I reckoned you could have got a mini (original design) in the back seat and still have room to spare.
Also agree that sun blinds would be nice, but not very often a worry in our climate, and when it is that hot I prefer to be in the shade drinking beer or out for a walk around my local part of the Cotswold's.
I recall once ion a trip to Middle East parking in the shade and then later on the sun came around and heated up everything. Burnt my hand quite badly when trying to close the door (nice chrome handle on some yank tank - Chrysler I recall), thank heavens the seats were cloth !!