For depth of the field 1992 Cox Plate would have to be the best in my memory...
Let's Elope - Cups double, Australian Cup, multi WFA winner
Super Impose - Cox Plate, Melbourne Cup placegetter, multi G1 winner
Better Loosen Up - Cox Plate, Japan Cup, Australian Cup
Rough Habit - multi WFA winner, Cox Plate placegetter
Sydeston - Caulfield Cup, Tancred/BMW, twice Cox Plate placegetter
Mannerism - Caulfield Cup
Naturalism - Caulfield Stakes, second Japan Cup
Kinjite - Epsom, George Ryder, 3 x G1 winner
Slight Chance - 2 x Oaks winner, 5 x G1 winner
Burst - 3 x G1 winner
Prince Salieri - 2 x G1 winner
Coronation Day - 2 x G1 winner
Palace Reign - Caulfied Guineas
Muirfield Village - the only non Group 1 winner in the field.