It is so hard to diagnose a sharp razor over the Internet but hey we try...

First your tests, the easiest way to learn all the tests in to buy a 5 pack of DE blades at Wally World or wherever you can find them... Try all the tests on these it will give you a "baseline"

Unfortunately no the cut doesn't mean the razor is shave ready it just means your approach to your face was either too steep or you stopped the razor...

Sideburns to jawline the "perfect pass" should tell you the shave readiness of any razor... Place the razor on the face with the spine touching the skin slowly start the down stroke and bring the spine away from the face until it cuts hair smoothly... that is the right angle...