The braking has felt fine. And since I own and drive two identical cars, I'm usually pretty sensitive to even minor changes/differences.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Well, if that rotor was not getting contact (or very little) and since the front brakes actually do most of the stopping of the car - it may have not been noticeable. Now, under full braking, I think you might sense or notice a difference between full-contact, 4-wheel disc braking, and not. It's good that you noticed something to look into. This thread is very helpful, since I think I ought to do more inspections on my own 4-wheel disc brakes/rotors vehicles.
I'll be interested in learning the source/reason is, for what you found on your car.

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'06 E320 CDI
'17 Corvette Stingray Vert

It's scheduled for a state inspection Monday morning, so I hope to have greater clarity after that. But I'm sure I'll just replace everything....I was pleasantly surprised by how cheap rebuilt OEM rear calipers are.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Keep in mind these are/used as taxis in other parts of the world.

I doubt it too. Time to re-caliper.

Thanks for the link JD. I am in the process of replacing the brake hoses on both E300's.

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Jim