In some sense, Zhang Yanhang felt that his Sonic Punch was the real deal, for the Sonic Punch from Magic Treasure was obviously an adjective, while his was genuinely a fist that reached and even surpassed the speed of sound.
Moreover, the key point was that Zhang Yanhang even believed that he could throw a Sonic Punch now. After all, humans have a much faster acceleration in their punches than their movement speed, due to their body's power generation structure.
Including a 15% Attack Speed Bonus, if Zhang Yanhang went all out and activated his Spiritual Energy enhancement, he estimated that he could indeed produce a sonic boom. The only reason he hadn't tested it was his recent promotion to Second Tier and his rapidly increasing Agility attribute.
If he really did a field test, creating a sonic boom would probably not be difficult. After all, the speed of sound is only 340 meters per second, but his Movement Speed had already reached eighty-two meters per second.