I have a lot of glaucoma damage to my eyes, especially my shooting eye, but to me comparing my IOR scopes to my Leupold scopes the IOR wins on resolution and the Leupold wins on color spotting.

The resolution of an IOR on 10X is the same to me as a Leupold at 12X.
The Leupold is better at finding a brown ground squirrel on brown dirt, by picking up on a few Golden stripes.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps