Time, track records, etc don’t mean much as each track is different. Same with purses… hard to compare based just on dollars won.
For me, any horse that is running and winning consecutive GI is quality, regardless of breaking records.
I found this on a quick Google with a snippet posted here… (I’m assuming a Group I is the equivalent as a Grade I in the US)
[h=2]Class[/h] [TABLE=“class: {regress: !result.Class.length}”]
[TR]
CLASS STARTS 1ST 2ND 3RD WIN% PLACE% [/TR]
[TR]
[TD]Group 1[/TD]
[TD]15[/TD]
[TD]12[/TD]
[TD]2[/TD]
[TD]0[/TD]
[TD]80%[/TD]
[TD]93%[/TD]
[/TR]
[TR]
[TD]Group 2[/TD]
[TD]9[/TD]
[TD]6[/TD]
[TD]1[/TD]
[TD]0[/TD]
[TD]66%[/TD]
[TD]77%[/TD]
[/TR]
[TR]
[TD]Group 3[/TD]
[TD]1[/TD]
[TD]1[/TD]
[TD]0[/TD]
[TD]0[/TD]
[TD]100%[/TD]
[TD]100%[/TD]
[/TR]
[TR]
[TD]Listed[/TD]
[TD]0[/TD]
[TD]0[/TD]
[TD]0[/TD]
[TD]0[/TD]
[TD]0%[/TD]
[TD]0%[/TD]
[/TR]
[TR]
[TD]Other[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]0[/TD]
[TD]0[/TD]
[TD]100%[/TD]
[TD]100%[/TD]
[/TR]
[/TABLE]