Bird ID is a difficult test for binocular comparison. I settled on my SHAMPOO BOTTLE test. It is in good light in a bath room some 30 ft away. The smallest print on the front was the test, "doctor tested, medicated" etc.
10x42 Monarch did well
10x new bin, yet to be announced here, did very similarly
next best was, ta daa, EagleOptics SRT 8x32
very bright and sharp in middle, soft toward edges
Nikon Travelite 9x25 not as bright, but passed test well
Nikon Action 8x40 did well, very bright, not as relaxed as EO bin above
with some trouble Nikon Sporter 10x36 also allowed me to read the text, a little dimmer now
Bushnell 10x40 roof prism Wal Mart special, struggled..I could just read the text but by now I had memorized it as well..should have tried the worst pair first