How do you all gage sharpness?

I have a couple of micro cameras, but setting all that up is a hassle.

There is the thread method by Steve Elliott or Brent Beach, I forget which.

Last wkd, I had some LV plate w 3M film, did some free hand swipes on a plane, and had good results-satisfied.

But, can't help thinking, is there a more objective way besides the above, or hair shave, bouncing light, etc?

My problem is that shop time is only a few hours on a weekend, so doing a lot of comparison plane/chiseling, and trying to remember what edge held better w which medium is really hard.

Of course, nowadays, my shop has all varieties of media, and I'd like to know how you all judge between your different choices. Can you remember edge performance like that?

Thanks, D