That same Schwann music catalog listed Emerson, Lake & Palmer - Trilogy, Billy Cobham - Spectrum (now on DVD-A), Uriah Heep - Return To Fantasy, Todd Rundgren - Initation and several other WEA quad titles that never saw the light.
We'll never know IF a quad mix was ever done for CTTE. Understand that master tapes can get lost or misfiled, never returned, etc. which creates the havoc when re-issuing time rolls around.
Note that the first-generation Police masters were found just in time for the SACD releases this month. We've never heard proper CD issues before this! At least one song wasn't even at the right tempo....