Booing or not... the video does not lie. Arnold (25lbs lighter than he was previously) was the best bodybuilder on that day.
Get over it.
It was very close and Arnold, being Arnold, won the day.
In 1980, Zane was lighter and off from his incredible 1979 winning form.
Mentzer looked good but lacked the chest depth and overall stage presence to defeat Arnold.
Roy Callender and Chris Dickerson looked incredible but seemed small next to a man of Arnold's stature.
Boyer Coe lacked abs and back detail and Platz was still too bottom hvy in 1980
I can see why Arnold won and have no problems with it.
Based on what I have seen , I would have picked it:
Roy Calender 1st, Dickerson 2nd, Arnold 3rd, Mentzer 4th...
I had Tom Platz winning in 1981 as he looked incredible.
Franco winning in 1981 was the worst Olympia pick of all time.