Circ results are not just the doctor's doing. Each person scars differently. Each person has different skin elasticity and the "grower" phenomena which defines circ appearance when flaccid to enable comfortable erections.
For an adult circ, the suture technique as well as bandage are more important than for a baby circ (no sutures, no erections and minimal bandage since a baby circ heals so fast)
But in all cases, the person's body does play a big role. With identical suturing, 2 guys will have different circ scars, different skin colouration after the circ etc.