Arnold definitely had the best biceps ever.
There has never been a pair like his since. It just puts me in awe everytime I watch him train or pose. He definitely was the greatest bodybuilder ever.
I bang out curls just like those shown in the video. Those are the only curls I do. I leave the rest to heavy rows and deadlifts, they do the majority of the size increase anyways. Curls are a small portion of size development.
Bicep shape and form is largely genetic. It's geting that size in there that does the trick for most. Some people's biceps peak really tight and high, some look long and flat. That's just how it goes.
I am luckily somewhat gifted in the shape and form of mine. I just need more overall size on my frame to really have an impressive pair.