Bruno Sacco the famous style engineer is responsible for what were termed sacco panels many body shops refer to them as side cladding. The cladding and the bumper paint were never as shinny as the body finish enamal paint. Over the counter Mercedes-Benz list the paint as a two part system color and clear.

It could be many things that caused it to look different from the orginal paint on the front and back bumper as well as the side cladding.

1) the way the painter laided on the color too far away causes a flat look with no distintion of reflection. sometimes this can be corrected by colorsanding if there is enough material of clear and polishing the panel or bumper in question to bring up the gloss.

I would try and fine a stock well cared for model your year and compare thepaint finish. try to fine a vehical that has not had any previous body work to these areas and take a newspaper and see how much reflection in the paint their is . another words if you can almost read the print in the reflection on a stock painted bumper than you have a problem with your body shop and I would point out that the paint on the car is the Standard they have to match.

Bob Geco