still inaccurate, i think.
i have a 1997 w140 coupe. it is badged S500[also true for S600 coupe].the w140sedan was also badged S500[also true for S600 sedan]. this is unlike my w126's which were badged S560SEL[sedan] AND S560SEC[coupe].
for the remainder of the w140's production run[1998-1999 model years], the sedans continued to be badged as S500, S600. the coupes, however, were badged as CL500, CL600.
i think that successor[2000-2003] S class coupes continue to carry the CL prefix.
at least that is the reality in my part of metroHouston.