You guys are nitpicking on small things Amir can't even do well. I give you passing
but jump shot?? Teams back away from him for a reason
Biyombo is a much better at rebounder/shotblocker/finish dunks/layups around the rim
again use the example of Amir stuggling to play against the Pacers big. While Biyombo just cleaned things up under the basket for 25 rebounds. Pretty much dominated Hill and Turner by himself
Amir is a career 32% three point shooter who has shot over 35% from three four times in his 11 year career. He's far from a knock down shooter, but he's capable enough that he CAN his the shot if you leave him open. Hell is probably a better three point shooter than Turner and Smart for his career, and certainly much better than Biyombo.
For his career he has also shot 48% from 3-10 feet (31% for Biyombo), 38% from 10-16 feet (30% for Biyombo) and 40% from 16 feet to the tree point line (22% for Biyombo). He's very capable of hitting the open jumper and has done so his entire career. Biyombo absolutely is not.
Even in the paint, Amir Johnson has shot an amazing 70% inside the restricted area, versus 64% for Biyombo. Johnson is absolutely one of the best in the league at finishing around the basket.
Amir Johnson has a career average of 1 assist per turnover, which is pretty solid for a big man. He's a skilled passer with high basketball IQ who reads situations well. That means for ever turnover he gives up (potential 2-3 points lost) he will also get an assist (potential 2-3 points gained) so ultimately he's got solid enough court feel to not be a liability.
Biyombo has a career average of 0.3 Assists Per Turnover which is utterly horrendous - he will turn the ball over three times (potential of 6-9 points scored for the opponent) for every one assist he generates (a potential 2-3 points). That makes him a major liability with the ball in his hands, and ultimately a black hole.
So yes, Amir Johnson is on a whole other level offensively compared to Biyombo.