Re-watch MoS btw, HB impacting with the fist of Hulk (as they slammed and stayed even we can assumed relatively even striking) causing a shockwave too weak to knock down a guy standing 15 feet away isn't impressive... that literally happened a dozen and a half times in MoS... Not to mention the football field sized shockwave from Zod and Mos colliding a the beginning of their fight,
The shockwave from the punch was bigger than ANY of the shockwaves from the MoS punches. The shockwave also destroyed the windows of multiple cars and sent them jumping. MoS punches did not. None of the punches from MoS knocked any human back either. The shockwave created from Zod and Supes colliding by charging at one another from dozens of feat away isn't as impressive as a massive shockwave caused by a casual punch. I'd also like to point out Hulk hitting HB hundreds of feat in the air and into buildings is far more impressive than how far the Kryptonians hit each other. Kryptonians possess the same mass as a regular human. The Hulkbuster has infinitely greater mass and weight than a regular human.