The blindingly obvious is like a beautiful woman, impossible to describe but instantly recognizable when seen. Think of your local school orchestra playing Beethoven’s 5th Symphony. They may get every note right, but compare their performance to the London Philharmonic. The difference is blinding obvious.
The same is true in business. There are two people. One is executing a plan and the other is just floating along, they may do the same things, but the difference is blindingly obvious.
You don’t have to ask if someone is wealthy. If you have to ask, they’re not. The difference between wealth and middle class is blindingly obvious. Look for the blindingly obvious in people with whom you work.