I am with Dave. While objective tests are a good thing, they don't tell the whole story. The most useful thing for me is to actually compare using identical real world subjects under identical lighting.
Resolution:
I use the backs of cereal and other food boxes at 20X the focal length distance. It works best if there is mostly print in various size fonts. Newsprint mounted on a board also works well. I also use a small pewter jewelry box.
Bokeh:
My daughter has a human hair china doll. I stage the doll in the foreground with some fake flowers and such behind. In winter, I also use a bare-branched bush in the backyard and focus on branches toward the center of the bush. Lately, I have been testing against lawn and coarse gravel as well to bring out "busy" or "nervous" bokeh. For some reason, I have never done the specular highlight test. I guess that aspect is less important to me.
Purple Fringing:
Tree branches/foliage against a bright sky, sunlit chrome tubing
Chromatic Aberration:
Bright/dark transitions; in focus, out-of-focus (front), out-of-focus (back).
General:
A variety of subjects:
- low/high contrast
- bright/muted colors
- Strongly backlit and/or specular light sources (coma and flare)
Steve