@John_Harshman you are well qualified to do this yourself, or just quote what I wrote in the OP:
See that the SIFTER curve is higher than the BLAST curve? That means it is performing better. The area under the SIFTER curve is about 2x more, so it’s about 2x more accurate.
Curve on the left is a pROC curve (a ROC curve plotted semilog), and curve on the right is a PR curve.
That 2x is very much an eyeballing, not an exact number.