Method to test stone's finish?

[jaswarb]

Is there some method to test stones against one another to determine which will finish smoother?

The obvious answer is to hone and shave with them both but is there a more direct less subjective method to limit the variables which doesn't involve electron microscopy? My honing skills haven't developed well enough to be eliminated as a variable.

I would like to determine if my HSB & CO OVB is adequate as a finisher. I have a Norton 8k and sometimes I will finish with a few strops on a crox paddle.