Have owned 4 to date and, still own and part own 2.
In order of ownership.
CLS 350 2006. Nice car, really drives fantastic. The seats available just not enough for my needs.
E55k. Not a lot to say on this, other than,BEAST. Mine was quite lite on spec. But the overall engine is quite something.
Joint owned.E320 CDI S211. 2004. Fantastic drive, built like a tank. Fantastic engine. Pulls like a train. Superb diesel unit. Very very comfortable. Had quite a bit of trouble with, but the positives outweigh the negatives.
Current, E63 6.2 W212. Most favourite exhaust note of a car that I have owned, it's stock at present, still unsure if I will alter it. Got some real nice touches to it. It's on a 59 plate so it's by no means the latest on offer. But it's what I like and always wanted to try the N/A AMG package in the E class. Had it on a few family breaks and it's really performed beyond expectations. I like them all in different ways but the 6.2 is special.
Would love to own along with current cars.
190E Cosworth, with a manual gearbox. I think one of the best looking motor vehicles ever produced.