I have been a Decca aficionado since the late 70s. I still have my Garrott Brothers Gold, an old Maroon and a FFSSMkIV C4E rebuilt by John Wright. The vintage C4E is just stunning, significantly better than my Garrott Brothers cartridge (retipped by John Wright). I wouldn't sell my C4E - it would be one of the things you would have to rip from my dying hands.
However, no matter how good the Decca is, it doesn't beat a 15 IPS master tape - no way. I have three 15 IPS 2 track R2R decks and some master tapes (some distribution masters and some safety copies). The 15 IPS tape just stomps all over the Decca (installed in a rewired vintage Hadcock 228 on a Platine Verdier with GT Audio Battery PSU) - no contest!
However, no matter how good the Decca is, it doesn't beat a 15 IPS master tape - no way. I have three 15 IPS 2 track R2R decks and some master tapes (some distribution masters and some safety copies). The 15 IPS tape just stomps all over the Decca (installed in a rewired vintage Hadcock 228 on a Platine Verdier with GT Audio Battery PSU) - no contest!