It is an interesting metric
I am well behind 1:1 (roughly 1:3) but this is probably due to a number of reasons.
1) My portfolio was stagnant for 5+ years due to a development which I struggled with - and at the end of 5years broke even.
2) several other significant losses during the GFC.
3) My income is high, and my portfolio base is small (relatively speaking).
I would like to think (hope) in the next few years my portfolio size will increase substantially, and hence should get back to being closer to 1:1 (or more).
Blacky